Marshmallows can be made beforehand and stored covered in the refrigerator.
Drink mixture can also be doubled and tripled and made ahead of time and stored in the refrigerator until ready to serve.
For a non-alcoholic version of this drink follow the recipe but simply substitute these ingredients for the liquid portion of the recipe.
2 oz heavy cream
2 oz store bought chocolate milk
1 tablespoon chocolate syrup
If you don't have a measuring cup that measures ounces you can use a tablespoon.
2 tablespoons = 1 oz