This is an interesting and informative webpage with content indicated by its title. Although the article is dated August 1998 the information is mostly of the 'timeless' kind, I'd say.
"A wide variation exists in the mineral content of bottled waters that are commercially available in North America and Europe: magnesium content ranges from 0 to 126 mg per liter, sodium from 0 to 1,200 mg per liter, and calcium from 0 to 546 mg per liter. Evidence links magnesium deficiency to sudden death, excess sodium to hypertension, and calcium deficiency to osteoporosis. Drinking water that is high in magnesium and calcium and low in sodium will help individuals achieve the recommended daily allowances of these minerals. Because wide variations exist in the mineral contents of commercially available bottled waters, understanding the potential beneficial and harmful effects of these minerals will provide valuable information on which water to choose."
It's always a good idea to check the mineral levels by looking at the nutrition information on the label. And remember that for the body to utilise calcium effectively, it needs a sufficiency of vitamin D, some good sources of which are sunshine, oily fish, liver, cod liver oil and milk.
Lose weight, reduce your risk of most cancers, high blood pressure, type 2 diabetes, stroke, heart disease, heart attack, vascular dementia, osteopenia, osteoporosis, hypercholesterolaemia, depression, liver and kidney problems, and improve your health in many other ways without drugs, hunger or expense by eating less salt! - Try it! - You will feel so much better!Read my Mensa article on Obesity and the Salt Connection
And see Sodium in foods
and FAT RETENTION