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This article (http://www.youtube.com/?v=FPH5vd__uJQ&) summarizes the importance of a survival water filter. Your main concern during a disaster is having clean water, because having access to clean, potable water is usually the first basic element that you will not be able to get when faced with a crisis situation. You will need approximately a half a gallon of clean water for basic survival, or more if you are in a stressful situation that causes you to use more water. This does not include water you will need for hygiene and basic cleaning, like washing your dishes and hands.
To get the full survival water filter article click here: http://www.absoluterights.com/make-a-survival-water-filter/