What makes bottled water so convenient is its shelf life. If the water is left out of sunlight, and outside the range of toxic chemicals, bottled water can last forever. Tap water, on the other hand, cannot be stored because it isn't drawn from a private source.
Does bottled water have more chemicals than tap water?
A 2008 investigation by the nonprofit Environmental Working Group found some bottled water is sullied with untested industrial chemicals and may not necessarily be cleaner than tap water. They do not break down naturally and release toxic chemicals when they finally do decompose, according to the Columbia Water Center.