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Mais, Bear Grylls ate elephant poop.

You don't have to dig it. If you boil dirty water, piss, anything that has water in it, then the steam that arises from the boiling is pure water. Catch the steam with something, then let it drip...

Well, I'm not a survivalist by any means or even a novice backpacker yet... but that sounds just gross to me. However, you can distill water from urine. Yes, it'll be chemically pure water, if...