Not me, I'm not stupid enough to risk my health..Wiki says it all with this line
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Originally Posted by wikipedia
Simple procedures such as boiling or the use of a household activated carbon filter are not sufficient for treating all the possible contaminants
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The water we drink from the taps normally has gone through a number of processes starting with filtration, deionization (or at very least a high pressure fed reverse osmosis which does both purposes) and finally a disinfection (various methods) which removes
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Originally Posted by wikipedia
Possible pathogens include viruses, bacteria, including Salmonella, Cholera, Campylobacter and Shigella, and protozoa, including Giardia lamblia and other cryptosporidia
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Not all water in the world needs such processes especially from underground sources but they have been filtered through the rocks which acts as a filter/deioniser but water from a surface run-off (lake, river, roof fed water butt) definitely will need all the above