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We can live quite a while without food, but without safe and uncontaminated drinking water the average body starts shutting down within 36 hours and is shut down by 72 hours. This is one reason water pollution is one of the more serious environmental problems to me. Everyone should have at least a week supply stored in case of a disaster and it wouldn't hurt to know how to purify water if you feel it may be contaminated. Here is some excellent information for anyone interested in the subject.

http://www.emergencywaterpurification.com