264.172 gallons.
It doesn't matter if you are talking about water, oil, or poisonous canola liquid. 1 fluid gallon equals 128 fluid ounces, which means there are 128 ounces of water in a gallon of water.
About 240 gallons.
1000000 gallons 10^6
I take it you mean "how many drops of water in a gallon"? :))
8 fluid ounces in a cup > 16 cups in a gallon > 16 x 8 = 128 ounces