Dozens of iconic Southern recipes call for buttermilk, the incomparable cultured milk that lightens, tenderizes, marinates, ...

For each 1 cup of milk or buttermilk , substitute one of the following: Instant nonfat dry (powdered) milk: 1 cup water + 1/3 cup powdered milk Non-instant nonfat dry (powdered) milk: 1 cup water + 3 ...