Mineral water is water containing not less than 250 parts per million total dissolved solids (TDS), originating from geologically and physically protected underground water source or spring that has been tapped at the spring opening or through a borehole.
Mineral water is distinguished form other types of water by constant levels and relative proportions of minerals and trace elements at its source allowing for seasonal variations.

No mineral may be added to this water. If the TDS content of mineral water is below 500 parts per million, the water may be labeled low mineral content.
If it is greater than 1,500 parts per million, the label high mineral content may be used. Depending on where the source is the minerals the water contains will vary.
If you suffering from a deficiency of certain minerals and are drinking mineral water for therapeutic reasons, you must be aware of which minerals are in the particular brand of water you drink.
If you drinking mineral water containing minerals that you do not lack, you could be doing your self more harm than good.
Mineral Water