Summary Bottled water is a safe alternative to tap water. Safety is assured by industry standards and by FDA regulation. But it costs about 1000 times as much as tap water. Tap water in the US is safe to drink, except in unusual circumstances, which are usually short lived. The EPA monitors the safety of public water systems.
Every body needs water.
Waller K, Swan SH, Delornze G, Hopkins B, Trihalomethaes in drinking water and spontaneous abortion. Every bodily function takes place in water. International Bottled Water Association Precise water requirements vary. The International Bottled Water Association offers a Hydration Calculator . It figures your specific water needs according to body size and activity level and suggests factors that might increase your requirements.