How many water bottles in a gallon?
The simple answer to this question is that approximately 8 bottles of water make up 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.