Bottled water is a very expensive ordeal when you consider that those single serve, 16.9oz bottles average up to about $7.50/gallon versus the average cost of tap water, which is $0.004/gallon. These numbers gathered from Business Insider's article lead to the conclusion that by buying bottled water over drinking tap, leaves you spending 2000 times more money per gallon.
The shock of this is put even further into perspective when we realize that bottled water is regulated by the FDA, versus tap water which is much more thoroughly regulated by the EPA, meaning tap water is tested in a laboratory, where as bottled water is not. So what are we waiting for? Lets make the full on switch to tap water, stay regulated, and save money.