Bake cupcakes according to recipe directions

Remove from oven and cool completely

Whip marshmallow cream, dairy-free margarine, powdered sugar and vanilla with electric mixer until it begins to get fluffy

Add water and whip well

Place cream filing into a piping bag with a wide star tip

Push the tip of the piping bag into the top of a cupcake and fill with about 1 tbsp. filling

Ice the top of the cupcakes with your favorite icing

Let cupcakes sit overnight before serving