You'll need to make three cups of homemade coca cola and pour them into an empty ice cube tray. Leave the tray in the fridge for a minimum of four hours. Personally, I leave it to freeze overnight until it's fully frozen.
Remove the cola cubes from the ice cube tray and transfer them to your blender or slush machine. Blend around ten cubes, along with 1 1/2 cups of cold cola you have leftover.
Enjoy and serve with a spoon or straw.