July 24, 2008 
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Crystal clear, rushing streams; plunging waterfalls; bubbling brooks — all convey an image of freshness and purity. But when you drink from them, be aware you are not the only drinker. Insects drink, too, and some of them lay millions of eggs in the water. Animals also drink and very often leave behind their wastes. Just one swallow of that fresh-looking ( and often fresh tasting ) water contains literally billions of microorganisms, some harmful to humans and some not. Even cold, swiftly flowing water contains bacteria, viruses, and quite possibly, microscopic parasites and worms. The chance of getting sick, sometimes seriously sick, just isn’t worth it unless it’s an emergency and you have no other source of liquid.
Today there are several compact, portable water filters designed specifically for use in the wild, and I strongly recommend that you use one if you don’t carry your own water with you.
Excerpted from the book “The Drinking Water Book — How to Eliminate Harmful Toxins from Your Water” by Colin Ingram.