Whole Milk + Water (Best Option)
3/4 cup whole milk + 1/4 cup water per 1 cup whole milkWhole milk provides fat and proteins that contribute to the tenderness and browning of focaccia. Diluting it slightly with water adjusts hydration without sacrificing fat content, which is crucial for the dough's elasticity and crumb.
When substituting, ensure the total liquid volume remains consistent to avoid altering dough hydration. Mix the milk and water thoroughly before adding to the dough.
This substitution yields a focaccia nearly identical in texture and flavor to the original, with a slightly lighter crumb and crust color but no significant compromise in quality.