The standard is 8 glasses a day, with a standard glass being 8 oz. So that is 64 oz. a day or 1/2 gal. Now, I think that is the standard for the average person. A person weighing a bit more may be able to up the water intake a bit since it takes more to keep yourself hydrated.
Here is the conversion of ounces to liters.
1 ounce [US, liquid] = 0.0295735 liter
So for the day: 8 glasses (64 oz.) would be 1.9 liters.
You would need 3.8 of your water bottles to make the standard for the day.
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