Source: http://feeds.gawker.com/~r/lifehacker/full/~3/423024076/your-bottled-water-may-be-no-purer-than-tap
According to a study conducted at the University of Iowa, many bottled waters are no purer than tap. The study found that while most of the brands tested still fell within regulatory guidelines for contaminants, much of the bottled water contained the same impurities as tap. Might be worthwhile to save a couple bucks this month and give tap another chance.