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 water is the most need resource straight after air. You can live weeks without food but only about three days without water. I myself get headaches and things because id don't drink enough water but some people don't even have that. Much droughts and floods can put toxic or waste into your water source and pollute it to the extent of not being able to drink from it. If you see complete Chrystal clear water don't drink from it it probably has bad chemicals in it in about nineteen ninety the us made a law that said toilets had to become smaller to preserve More water. Also that's why we have filters on our water to keep it safe city waters is processed in one huge plant.