For best results, make and serve this punch fresh since the soda loses its fizz over time and melted ice cream loses its creamy sparkle. To prep ahead, you can mix the condensed milk, almond extract, and 1 cup of soda and chill until party time; add to ice cream and soda right before serving. For variations: try peppermint extract instead of almond; swap in ginger ale; or add a splash of cranberry juice for color. Make it dairy-free by using vegan ice cream and sweetened condensed coconut milk. To turn it into a cocktail, add a bit of amaretto or vanilla vodka.