Man vs Wild: Purifying Water in the Wild
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Ever wonder how to purify water from a stream, so you can safely drink it if stranded. Bear Grylls from Discovery Channel's "Man vs. Wild" shows you how to dig a trench above a level of the water,... (more info)

Ever wonder how to purify water from a stream, so you can safely drink it if stranded. Bear Grylls from Discovery Channel's "Man vs. Wild" shows you how to dig a trench above a level of the water, so it can be filtered by the sand and gravel.

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