Cut the watermelon in cubes. Pop them in a food processor, or blender and pulse until it's liquid. Now strain the watermelon juice through a fine mesh sieve. Use the back of a spoon to press the watermelon down to get all the juice out.

Transfer the watermelon puree to a large pitcher. Add water and sugar, then mix until the sugar dissolves. You can use more or less sugar, or a sugar additive if your diet calls for that.

Add the ice, give it a mix, and be ready to change the world, or whatever.

Serve with a big old watermelon-loving smile!