Making champagne ice cubes is so easy. It comes down to a simple 1 to 3 ratio of sparkling water to your favorite prosecco, cava or champagne. Combine them in a measuring cup and pour into a silicone ice cube mold. Since alcohol doesn't freeze, adding the water allows the sugary sparkling wine to set up. Freeze the tray until it's solid, then use them in brunch mimosas and champagne cocktails without the dilution of regular ice cubes.