How many water bottles equal a gallon?

Water bottles equal a gallon means the volume of a water bottle varies a lot. There are 128 ounces in a gallon. If you are working with water bottles in liters there are 3.785l per gallon. If you are working in U.S. customary units, divide 128 by the volume of the water bottle. Substitute 3.785 for tge 128 if you are working in the metric system. Your answer will be somewhere between 3 something and 20 something