8 oz = 1 cup
4 oz = 1/2 cup
2 oz = 1/4 cup
1 oz = 1/8 cup
1/2 oz = 1 Tablespoon
If you want to know an equivalency for less than an ounce, cups would not be the best unit of measure. Might I suggest using the SI metric system? Since the conversions are all base-10 going from liters to milliliters is much easier than ounces to tablespoons to cups etc.
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Since there are eight fluid oz. to a cup (and since one fluid oz. of water also weighs about one ounce) the answer is 100/8 = 12.5 cups.