Scoop out 5 cups of fresh watermelon. Place in a blender and whirr until everything is liquified.
5 cups fresh watermelon
Place a fine mesh sieve (optionally lined with cheesecloth) over a bowl and slowly pour the watermelon juice through. Let it sit for about 5 minutes above the bowl so all the juice can drip through.
Serve as is or over ice - optionally with a squeeze of lime or fresh mint.
Store leftover watermelon juice in the fridge for up to 4-5 days. If it separates in the fridge just give it a stir before serving.