This recipe is for non-alcoholic slushies, but you can easily add vodka or gin if enjoying at cocktail hour.
10 cups watermelon
Juice from 1 lime
4 cups ice
1 1/2 cups sparkling water
1/4 cup basil
Blend watermelon until liquid.
Add ice and blend again until slushie consistency is reached.
Add remaining ingredients and blend one more time until everything is incorporated.
Serve in a tall glass with mint or basil leaves as garnish. Enjoy!