I really want a lifestraw: http://www.buylifestraw.com/ for just that reason. There are definitely a few places that have natural, potable springs (Manitou Springs, CO and Olympia, WA are 2 of my favorites). But otherwise it's definitely best to filter random water.
And Cirno, while that's good for removing particulates, it won't kill/remove any bacteria. Bleach (8 drops per gallon of water, and let it sit for a bit) or iodine tablets are a sure way of doing that.
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