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how many 16 oz water bottles equal a gallon

Now, how we can reach this conclusion? In simple terms we must understand the units used for a simple bottle (in most cases it is in liters). So, for an average user a most common bottle used in everyday life is a regular pet size 500 ml bottle. These types of 7 and a half bottles (7.57) equals to a gallon. As rounding off can be necessary in this case therefore we approximate it as 8.