The Lemon-Ade-Rita Watermelon Agua Fresca is a simple, delicious recipe that will be a hit at your next fiesta! 1) Muddle 3-4 chunks of watermelon with a dash of agave nectar in a mixing glass. 2) Add ice, seal and shake vigorously until chilled. 3) Add Lime-A-Rita and pour into glass. 4) Stir, garnish and serve.