Fill a shaker with ice.
Pour vodka, Cointreau (or Triple Sec), fresh lemon juice and cranberry juice into shaker.
Shake vigorously until the outside of the shaker is very cold.
Fill a highball glass with ice.
Place the watermelon cube inside the glass.
Strain the shaker into the glass, ensuring to cover the watermelon cube.
Fill the rest of the glass with Cal & Gary’s Sparkling Watermelon Water.
stir gently and garnish the glass with a lemon wheel.