•8 cups cubed seeded watermelon•1 cup water•1/3 cup sugar•1/4 cup fresh lime juice•1 liter club soda or seltzer, well chilledCombine half the watermelon, half the water and half the sugar in a blender and puree.Pour the pureed mixture through a coarse strainer into a large container. Repeat with the remaining watermelon, water and sugar. Stir in lime juice.Refrigerate until well chilled, about four hours. To serve, stir in club soda and garnish with lime.