Since there are 128 ounces in a gallon you need to multiply the number of gallons by 128 (6 times 128). This tells you that there are 768 ounces in six gallons. You then need to divide 768 by 12 (the number of ounces in each bottle) and you get 64. So you need 64 12oz bottles to hold 6 gallons of liquid.
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If it's a British gallon, then it's just over 6 bottles as a gallon is just over 4.5 litres (2 x 75cL bottles = 1.5 litres)
If it's an American gallon, which is about 3.78 litres, then it's just over 5 bottles.
The "standard" size for wine bottles is 750 ml. 6 liters would be 8 bottles.
There are also larger sizes of bottle, which unfortunately have names that are not always standardized. A "Jeroboam" may be either 3 or 4.5 liters depending on the tradition of the place the wine was produced, and there's a six liter size as well, variously called an "Imperial" or a "Methuselah". (For some reason, a lot of wine bottle sizes are named after Biblical figures.)
There's even the truly gigantic "Melchizedek", which holds 30 liters.
With 15 gal of wine you will be able to fill 75 bottles (750ml)
Cheers:)
VinoEnology.com