Why does water have no taste?

No, water does not have a taste.

Answer:

Connoisseurs of water have preferences in the taste of the water they drink. This is due to the contaminants present (or absent) in the water. Water potability (usefulness as a drinking water source) is ranked in part by standardized taste and odour tests. Many of the natural spring waters bottled for sale have built their reputation on taste and the better tasting ones sell at a premium price. Scotch drinkers in particular opt for specific waters from springs and glaciers that improve the taste of the scotch.

Water without contaminants (even gases such as air) is described as having an insipid taste.