mineral water

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Naturally occurring or prepared water that contains dissolved mineral salts, elements, or gases.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Water, containing dissolved minerals, which has been treated in any of several ways (filtering, aerating etc) before being bottled; used either therapeutically or out of preference.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun water naturally or artificially impregnated with mineral salts or gasses; often effervescent; often used therapeutically