I have never used these but the Berkey filters look good. They are gravity filters that require no electricity, and are available in several sizes. They remove bacteria, viruses, and lots of chemical contaminants.
As one might expect, they are not cheap.
We made our own DIY Berkey water filter system to use on our property up north. Much cheaper and the filters can be found on Amazon.com for about $100.00
There are videos on YouTube on how to make a DIY filtration system with a couple of 5 gallon buckets. I still would not trust the store bought nor the DIY filtration system to remove chemical contaminants though.
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