The recommended daily amount of drinking water for humans varies.
[3] The common advice to drink 8 glasses (1,900 mL or 64 US fl oz) of plain water per day is not scientific; thirst is a better guide for how much water to drink than is a specific, fixed amount.
Inorganic minerals generally enter surface water and groundwater via stormwater runoff and through the ground.
Water treatment also adds some minerals, such as calcium, zinc, manganese, phosphate, fluoride, and sodium compounds.
Other elements, such as fluoride, while beneficial in low concentrations, can cause dental and other problems at high levels.