That's going to depend on how many ml each water bottle holds.
If all of them are the common 16.9-ounce size, then you need
nominally 2,000 of them.
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1 liter is equal to approximately 0.59 bottles of water.
2 A quart is equal to 32 oz.
10 million gallons is equal to: 1,337,000 cubic feet.
Are these 2 liter bottles? If so about 20.
500 million