3. Mixing the Wet Ingredients
The next step is to mix the wet ingredients together.
While sugar may seem like it belongs in the dry ingredient mixture, it actually should be mixed with the wet ingredients. The milk, water, sugar, and butter should be placed in a liquid measuring cup. If you do not have a liquid measuring cup, simply use a bowl instead. Make sure that you melt the butter beforehand so that it will easily mix with the water, milk, and sugar.
Once you have placed all of the wet ingredients into your measuring cup, use a whisk to stir them together. You want to make sure that this mixture is well blended. A coil whisk or fork can be used, but a standard whisk will typically do the best job. You should whisk these ingredients for at least a few minutes so that they are well combined.