How many 16.9oz Water Bottles equal a Gallon?

A gallon is equal to 128 ounces. To find how many 16.9-ounce water bottles equal a gallon:

\frac{128 \text{ ounces}}{16.9 \text{ ounces per bottle}} \approx 7.57

So, approximately 7.5 16.9-ounce water bottles are needed to equal a gallon.