Plastic party cups, food coloring, ice, and any clear drink. Place 2 to 3 drops of food coloring at the bottom of each party cup and let dry. Just before serving the drinks, fill each cup with ice to hide the food coloring. Harry Potter Fiesta, Cumpleaños Harry Potter, Harry Potter Birthday, Harry Potter Recipes, Harry Potter Snacks, Harry Potter Activities, Do It Yourself Food, Fiestas Party, Anniversaire Harry Potter