It's 3:2:1 Prosecco: Aperol: soda water with a slice of orange and ice. Dunno, Dave, I just follow orders, and a bottle of soda water is by far the cheapest ingredient! I suppose it would work without. I keep all three things in the fridge.

We have these "ice cubes" in the freezer that are made of thick plastic with some sort of gel inside. They are infinitely reusable and they don't dilute the booze, a plus point in m'humble, and very useful if you forgot to put your white wine in the fridge in time...