Here is a quick and easy substitute for canned sweetened condensed milk. Take 1 cup of dry milk, 2/3 cup of sugar, 1/3 cup of boiling water, and 3 tablespoons melted butter. Combine all the ingredients in a blender and blend until it becomes smooth. You will either want to use it right away or store it in the refrigerator until you are ready to use it. This makes the same amount as one store bought can.