Interesting question...haha I thought perhaps around 1.5-2L but it turns out it takes around 3.
Picking on the nitty-gritties - 1 liter goes inside the bottle and 2 liters are needed in the production process-according to a 2006 estimate by the California-based Pacific Institute.
They even calculated the amount of oil needed to fill the bottles with water, transport them, chill them, and dispose of or recycle them - 250 ml per bottle.
Read more at:Bottled Water and Energy
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