Prepping for Memorial Day: Acapulco Cliff Hanger

From Backyard Bartender:
55 Cool Summer Cocktails,
y Nicole Aloni

1 cup watermelon chunks, pureed in the blender and strained (makes about 1/3 cup)
2 ounces light tequila
1 ounce lemon simple syrup
1 ounce lime juice
1 ounce Cointreau

This inventive drink will take the edge off a scorching afternoon. Fill a chilled glass with ice. Pour everything, except the soda, into the glass and stir to chill. Add soda and stir again. Squeeze the lime on top and drop into the glass. Garnish with a lime wedge and serve.