First, wash, dry, & freeze your grapes for at least 6 hours, or overnight.
Add grapes to the blender, slice and juice lemon and add to blender, then add the coconut water. It’s a little bit of a preference thing, how much you put in. If you want it to be more liquid, add 1/2 cup. If you want it to be thicker, I would add 1/4 cup.
Pour into a glass, add a straw if desired and enjoy immediately!