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I keep six important criteria in mind when using each reusable water bottle: filtration and filter capacity, material, taste, ease of use and cleaning. These are all factors you should consider when looking for a water purifier bottle. You will need to purchase one that suits the activity you plan to use it for. For example, if I was looking for a filter bottle to take in my backpack, I wouldn’t choose Brita. I also wouldn’t invest in a Grayl Geopress if I only needed a bottle for tap water.
filtering
Look for a filtration mechanism that filters out harmful contaminants, bacteria, viruses and other unpleasant things from water that is supposedly undrinkable. Does the filter leave any particles in the water after filtering? Also consider how much it will cost to replace the filters and how easy it is to replace them.
Materials
Most filtered water bottles are made of plastic or stainless steel. If the bottle you are considering is made of plastic, make sure it is BPA-free. Also make sure it is durable. Will a few drops damage my water bottle? If you are traveling and need a lightweight bottle, is the material too heavy?
taste
It’s pretty obvious, but you want a filtered water bottle that gives you fresh-tasting water. You don’t want any residual metallic odors or chemical tastes like chlorine.
Ease of use
Putting the bottle together should be easy. Inserting and replacing the filter should be simple. Also consider how water flows from the straw into your mouth. Do you have to tilt it a certain way to get the water out?
cleaning
You want a filtered water bottle that’s easy to clean. Check to see if the bottle is dishwasher safe. After use, what are you supposed to do with the bottle? Can you store it easily?
NSF/ANSI certification
Indicates products that have been tested by the National Science Foundation and the American National Standards Institute to ensure safety, reliability and quality.