Hi Hannah, the ounces we are referring to is a weight measurement, not fluid ounces (which is a volume measurement). When you discard half after the first feeding that should leave you with about 1/2 cup (4 ounces, 113g) of starter, to which you will feed 1/2 cup (4 ounces, 113g) of water and 1 scant cup (4 ounces, 113g) of AP flour. So, subsequent feedings for this starter should look like this: 1/2 cup (4 ounces, 113g) starter + 1/2 cup (4 ounces, 113g) water + 1 scant cup (4 ounces, 113g) unbleached all-purpose flour. 

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