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a hot climate, up to litres a day may be required. [ ] typically in developed countries , tap water meets drinking water quality standards, even though only a small proportion is actually consumed or used in food preparation. other typical uses include washing, toilets, and irrigation . greywater may
virtually all potable water, some of which play a role in metabolism. for example, sodium, potassium and chloride are common chemicals found in small quantities in most waters, and these elements play a role in body metabolism. other elements such as fluoride , while beneficial in low concentrations...
https://en.wikipedia.org/wiki/Drinking_water