Homemade cake is utterly delicious, but box cake can turn out just as yummy (almost?) with a couple of tips. Box cake is usually mixed with some combination of water, eggs, and oil. Well, if you switch melted butter for the oil and milk for the water, your cake will turn out more flavorful. Swap out the ingredients in the same amount listed and follow the directions on the box for baking. Your box cake will turn out rich and moist.