Although our knowledge is still evolving and no clear conclusions can be reached as yet, studies have suggested that a low water intake may increase long-term risk of kidney dysfunction and may raise the risk for the development of hyperglycemia, meaning high blood sugar.

Certain mineral waters, but certainly not all, can contribute quite a bit to the required intake of certain minerals.
Other types of bottled waters, and that includes the most popular brands, contribute hardly anything.

And studies have also shown that on average, the mineral content of tap water exceeds the level in common bottled waters such as Spa reine, Nestle Water Pure Life, Aquafina and Dasani, yet is lower than the level found in more expensive European brands of mineral water such as Perrier, Vittel and San Pelligrino.