Ok, so of the 5 essential elements of survival, water is the first one on the list. I have done a little research, and the filters on this page are among the best commercial ones available. http://www.pleasanthillgrain.com/berkey_light_big_berkey_water_filter_british_berkefeld_portable_purifier.aspx
There are other kinds that require pumping, but these are gravity fed and have a high rate of purification when it comes to quality and volume. Hope this is helpful.
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