Saliva : about 1 liter per day Gastric juice : between 2 and 2.5 liter Bile : 0.5 liter Pancreatic juice : 0.7 liter. Intestinal secretion : about 3 liter. The blood contains about 3 to 4 liter of water.
Calcium : good for bones strength and growth of children. Tap water can cover 15 to 25% of daily needs. Magnesium : important for the functioning of muscles,for blood quality and for the protection of the brain. Fluorine: who is involved in the protection of theeth against cavities.