Water filters

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According to research by Micha Hummler:

"as far as drinking water is concerned, Josh Kearns and his Aqueous Solutions are one of the leading experts and his wonderful work is licensed under CC-Share Alike 3"


Here is a $90 DIY water filter for purifying rainwater to drinking quality. Bill of materials and instructions are included (CC-SA license):

http://www.aqsolutions.org/images/2008/05/bucket-filter.pdf