"water is no different than most things" is precisely what this article (and the UN; the right to water and sanitation was added to the human rights awhile ago) disagrees with. Would you apply the same logic to oxygen instead of water?

Even accepting that water is no different than say cars, I disagree with the peacefulness of the free market. The free market is all about competition. In this case, competition drives the groundwater table down fast (a couple of meters a year, in some places), and forces everybody to play the game of drilling ever deeper holes.