Put all of the ingredients into your blender and blend well.
Pour the watermelon mixture into popsicle molds and freeze for at least 4 hours or overnight.
Notes
If you're using dixie cups and popsicle sticks as molds, freeze for an hour before putting the sticks in. For extra boozy popsicles, omit the club soda and substitute it with more vodka. For non-alcoholic pops, use club soda in place of the vodka. You can use up to 1/4 cup sugar depending on how sweet your watermelon is.