Wash all produce well. Cut into pieces the size that your juicer brand recommends, and juice. For the watermelon, you can juice the flesh, or the flesh and some or all of the rind.
Notes
A botanical relative of watermelon, cucumbers are another great hydrator, made up of 96% water. No wonder they taste extra good in summertime. Cucumbers may protect our brains, reduce cancer risks, manage stress and support digestive health.