Americans pay more for bottled water per gallon than they do for gasoline... and this when they can get free, often times higher quality, water out of there taps. The environmental impact of the popularity of bottled water is staggering, between creation of bottles, transporting, and disposing the cost are huge... and for the most part completely unnecessary.

While certainly there are times when its necessary, it should be avoided whenever possible. Here's a link explaining in more depth.