Cut one quarter at a time into one to two inch wedges. Slice off the rind at the end of the edges. Cut all the wedges into roughly even cubes. Cut smaller cubes if you have a less powerful blender. [2] X Research source Measure out the cubes until you have eight cups of watermelon. [3] X Research source

It does not matter which liquid you add first. You just need liquids at the bottom of the blender.

Keep pulsing the drink until things are beginning to mix smoothly. Fruit should stop getting stuck on the bottom and all the ingredients should be swirling together.