In a blender, add watermelon, lime juice, salt and honey. Blend well. You can strain with a mesh strainer if you want it extra smooth, but you do not have to.
Add more honey to taste - this will depend on how ripe your watermelon is & how sweet you'd like it to be.
Mix equal parts watermelon juice & sparkling water and add ice. Enjoy!
Save extra watermelon juice in a mason jar with lid for up to 2 weeks.