This is the perfect Fourth of July cocktail - and it's ridiculously easy to serve a huge crowd with it. I've been making it all summer already and my friends adore it.
Puree watermelon in a blender and mix equal parts lemonade and watermelon puree. Serve in a giant bucket. For extra credit, add vodka. I usually add 1 part watermelon + 1 part lemonade + 1 part vodka!