1 1/2 oz of Vodka
1 1/2 oz of blue curacao liqueur
1 1/2 oz of Midori melon liqueur (or watermelon liqueur)
2-4 oz of Lemon Soda
Pour the vodka, curacao and Midori melon liqueur into a collins glass filled with ice cubes. Fill with soda, to taste, and serve.