It takes “more than 18 million barrels of oil and up to 130 billion gallons of fresh water a year to create” bottles for bottled water.
Repeat: 130 billion gallons of fresh water to create the bottles.
All that is before the “41 billion gallons of water [which] is then used to fill them – water that is often just tap water.” According to a study at the Oregon State University.
Please, please stop buying bottled water. It is really bad for your health, a waste of money, and a waste of water. Tap water in a reusable bottle is just fine. If you need it, use a filter like Brita or Pur.