How to make a survival water filter ?

Next to knowing what foods one must prepare in order to survive, it is crucial to have what to drink. The body needs proper hydration to survive. In an emergency usually water can be found the problem is that most probably it will be contaminated or undrinkable. Fortunately there many methods and some of them quite simple to produce very good quality drinking water from some pretty awful stuff. This knowledge is really a must. please watch the following video that gives very good step by step instructions on how to make a water filter from things that are almost always available

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