A few interesting links provided as part of this article about one of our most precious commodities!
Studies have shown that, in blind taste tests, people can't really tell the difference between tap and bottled water. (Wine drinkers have also failed similar kinds of taste tests over inexpensive versus expensive wines.)
LINK: https://www.techdirt.com/articles/20100520/0946139511/dailydirt-theres-no-such-thing-as-free-water.shtml