After reviewing dozens of survival water filters, the Grayl GeoPress Water Purifier is the best survival water filter we tested.
It’s lightweight and compact, making it ideal for carrying on long treks. It is the same size as a common water bottle, and it works in only a matter of seconds. During my testing, it took about ten seconds to purify 24 ounces of water. That’s far faster (and easier) than other options on the market.
There are tons of survival water filters and purifiers out there today. To find the best ones, I tested each with my team, which includes survivalists and military veterans. Blake, one of our team members, has experience in training groups for emergency relief. He’s used many of these filters in the field during actual emergencies.
These filters are intended to be used away from home in a survival situation. For solutions we use to purify water at home, see our guide on The Best Emergency Water Filters for Families.
We ranked each water filter based on its effectiveness, ease of use, and efficiency. A quality filter is an important part of preparedness, but it isn’t the whole plan. Our Emergency Water Guide covers everything from long-term storage to water purification and emergency planning.
Keep reading to find out what they are and which is the best for you.
Quick Comparison of Our Favorite Survival Water Filters
Grayl Geopress Water Purifier
Full Purifier
Filters Fast
Portable Bottle
MSRP: $99.95
Sagan Life XStream Water Purifier
Activated Carbon
Straw and Pump
Easy to Use
MSRP: $64.99
Save 10% off at Sagan Life with code “Water10”
Lifestraw Water Filter
Compact
Affordable
Lightweight
MSRP: $19.99
Sawyer Mini Water Filter
Compact
Versatile
Includes Pouch
MSRP: $28.99
Sawyer Gravity Water Filter System
One Gallon Capacity
Hanging System
Easy to Use
MSRP: $45.99
Best Survival Water Filters
Grayl GeoPress Purifier – Best Overall
- Rate: 5L/min
- Removes: Viruses, bacteria, protozoa, chemicals, and heavy metals
- Weight: 12.5 oz
- Filtration Capacity: 65 gallons
- Water Storage Capacity: 24 oz
Despite being relatively unknown, the Grayl GeoPress Water Purifier is easily the best survival water filter. Through my testing, I discovered that it is exceptionally faster than other water filters out there. Its broad spectrum filtration and compact design are unmatched.
I’d recommend it for anyone preparing for an emergency, hikers, and bushcrafters.
I put the GeoPress to the test on several of my trips camping and hiking. I filtered water from streams and out of a lake. The press mechanism is a game-changer. It makes filtering water both effortless and efficient. After a long day on the trail, the last thing I want to do is spend time hanging a gravity bag.
The fast filtration meant I could quickly fill my bottle without waiting, a huge advantage to other filters. Since it has a built in bottle, I can quickly fill, press, and then drink. I can take it with me, instead of needing a separate container to put my filtered water into.
The water was also of excellent quality. I pulled water straight from murky streams, and it quickly delivered clean, drinkable water. It didn’t taste weird, unlike many other filters I tried. There wasn’t an aftertaste, and I felt confident in the water.
Compared to competitors like Sawyer Mini or LifeStraw, the GeoPress stands out for its ease of use and speed. I found pressing to be much faster and less tiring than pumping or sucking, especially when my hands were cold or wet. Plus, it is a purifier, not just a filter, so it is the best you can get.
Personally, the GeoPress became my go-to companion for every hiking trip and emergency. It’s given me the freedom to drink from practically any water source. Plus, when paired with the Pathfinder nesting cup, the combo is tough to beat.
It is also our top pick in our multi-level survival gear list strategy guide.
Recommended for:
The innovative Grayl GeoPress is a worthwhile investment for anyone who needs a convenient, fast way to filter water. It’s easily the best survival water filter I’ve encountered.
PROS
Unmatched Speed
Built in 24oz Bottle
Full Water Purifier
Extremely portable
Simple to use
CONS
Higher cost
Sagan Life XStream Water Purifier – Most Versatile
Save 10% off at Sagan Life with code “Water10”
Lifestraw Water Filter – Best Budget Option
- Rate: up to 3L/min
- Removes: Bacteria, protozoa, and parasites
- Weight: Less than 2 oz
- Filtration Capacity: 1,000 gallons
- Water Storage Capacity: None
The Lifestraw water filter is a personal water filter that’s a straw-like device. It lets me drink directly from contaminated sources like streams, lakes, and even puddles. It’s ideal for those who want a small backup filter or shorter excursions like hiking. It does remove bacteria, protozoa, and parasites, but it doesn’t remove other harmful substances.
Sawyer Mini Water Filter – Most Compact
- Rate: 2L/min
- Removes: Bacteria, viruses, and protozoa
- Weight: 2 oz
- Filtration Capacity: 100,000 gallons
- Water Storage Capacity: 16 oz
The Sawyer Mini water filter is a tiny water filter that takes up minimal space. It can remove most of the common contaminants and is extremely lightweight to boot. Plus, it’s easy to use and requires minimal maintenance.
Sawyer Gravity Filter: Best for Groups or Families
- Rate: 0.5 L/min
- Removes: Bacteria, protozoa, cysts, and microplastics
- Weight: 1.5 oz
- Filtration Capacity: 100,000 gallons
- Water Storage Capacity: 1 gallon
The Sawyer Gravity Filter is a reliable, simple way to filter a lot of clean water while camping or during emergencies. It’s perfect for families and groups of up to five people. Plus, its impressive filter capacity allows it to filter tons of water before the filter becomes inefficient.
Blake has used the Sawyer gravity filter for years. He typically fills the bag up and hangs it on a tree branch. It’s best to have two hands for this job, we found, but it is possible to do it by yourself. The water will flow through the filter thanks to gravity. It is very slow, but you don’t have to pump.
Once done, you’ll have a full gallon of water to split between several water bottles. (You do have to put it into a separate container for transport. The bag alone isn’t practical for carrying around.)
When not in use, the bag folds down nicely. It comes with a pouch, but Blake didn’t use it for more than a few trips. Its lightweight design and durability make it very easy to transport around.
After filtering, the water it leaves behind is very clean and odorless. It doesn’t have a weird taste like some chemical purification options leave behind.
Because the filter rate is so slow, you do have to plan ahead. We tried this gravity filter next to the Grail filter, and the Grail was exceptionally faster (and easier to use).
Recommended for:
The Sawyer gravity filter is a solid option if you have a fairly large group. It has a much higher capacity than other filters. However, it is very slow due to its gravity-driven design.
PROS
Straightforward and simple to use
Folds into a very small footprint
Inexpensive
CONS
Very slow filter rate
Requires hanging
Tips for Choosing the Best Survival Water Filter
According to the survival rule of three, you can only live three days without water. That’s why you should never leave having fresh, drinkable water to chance. But with so many options, finding the perfect match can be overwhelming.
But don’t worry! I’ll explain exactly what you must consider when choosing a survival water filter.
Assess Your Needs
There isn’t a single water filter that works for everyone. If there was, I wouldn’t have written this whole guide. It’s important to consider what you need to select a proper water filter. Here are some questions we recommend asking:
- Will you be solo or with others? If it’s an emergency, don’t forget to select a system that will work for your entire group.
- Is weight a concern? If you are backpacking a long distance, weight may be a big concern.
- What water are you purifying? Water in rural woods is much different from a murky city puddle. If you live in an urban area, filtering out chemicals is a must.
Answering these questions should help you determine exactly what you need to purchase. In some cases, several different water filters may be best. Having a Grayl plus a smaller Sawyer as one of your go bag essentials is a great choice for example.
Features to Prioritize
After you’ve assessed your needs, it’s important to know what you’re looking at when reviewing survival water filters. The terminology can be a bit complicated! Here are some terms that are important to understand:
- Flow Rate: This is how fast a water filter processes the water. Speedy filters are typically better, as you don’t have to wait for your water.
- Capacity: Some water filters can hold gallons of water. Others don’t hold any at all. Choose a capacity that matches the number of people you use water for. (Or, you may need to purchase several smaller filters. I prefer a Grayl per adult person, for instance.)
- Weight and Size: If you’re backpacking, weight matters. Don’t get a huge filter for your hiking trip.
- Ease of Use: Simple filters are typically best, as complicated instructions are easily forgotten in an emergency. Look for filters that only require one or two steps.
- Filter Capacity: This refers to how many gallons a filter can process before it no longer becomes effective. Of course, more is better. However, you should also consider the price of replacement filters.
- Filter Effectiveness: Some filters can only remove common contaminants like bacteria and parasites. However, if you live in an urban setting, you must filter out chemicals. The Grayl is the most effective at removing various contaminants.
Pump vs. Gravity Filters
There are two main types of survival filters: pump filters that require you to push water and gravity filters that do not.
Pumping does require some effort. However, these filters often have a faster flow rate. Quality pump filters won’t make you work that hard to pump the water, though. The Grayl is very easy to pump down, and the whole action takes about ten seconds.
Many people make a big deal out of pump filters because they require some work. However, in my experience, they’re very easy to use.
Gravity filters only rely on gravity. Typically, there are two bags or containers. You place one above the other. In the woods, you can hang it from a tree. However, filtering water in a field can be a bit complicated. You have to have something to hang the bag from.
Gravity filters are also a lot slower. Gravity doesn’t pull water as quickly as a pump. However, they also don’t require any manual labor on your part. They can be a good option for “filling and forgetting.” Blake has filtered gallons of water by filling up a gravity filter and letting it work for an hour or so.
The Best Survival Water Filter for You
I typically recommend the Grayl GeoPress water filter. It works much faster than other filters and is exceptionally easy to use. During my testing, it was easily one of my favorites (and I’m keeping it in my emergency kit).
However, if you need a small filter, I recommend the Sawyer Mini water filter. It’s very small, so keeping it in your bug out bag as a backup or in your vehicle get home bag is a great option.
Of course, all the water filters on this list are our favorites! Any of them will work well in an emergency to keep you and your family hydrated. Also consider keeping a backup to your filter. See our guide on the Best Water Purification Tablets for our favorites!
Many of these filters have been featured by Battlbox. Be sure to check out our full Battlbox Review to see how you can save some money!
Be sure to check out our full How to Start Prepping guide as well as our other Survival Guides and Gear Reviews like our Favorite Survival Lighters!
