Just got my Nat Geo Magazine, This issue was all about water.
This is a method that is being used, and seems to be effective in a lot of third countries.
SODIS, solar disinfection
Basically filling clear water bottles, leave them in direct sun for 6 hours, on a metal roof, kills a lot of the nasties.
http://www.sodis.ch/methode/index_EN
Something to think about if you don't have all your filters, and such.
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