16
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16 bottles. There is 128 ounces in a gallon, so you divide 128 ounces by 8 ounces in a bottle to get 16. Another way to think about it is 8 goes into 128 16 times, therefore you will need 16 8 ounce bottles to make a gallon (128 ounces).
1 imperial gallon is equal to 160 fluid ounces. Therefore, there are 160/8 = 20 eight-ounce cups in one gallon.
1 gallon = 16 cups
1 cup = 0.06 gallon
Depending on the concentration of alcohol in the gallon and in the prepared drink.