Optional: Rim your glass by dipping it in lime juice, then in sugar.
Fill a cocktail shaker with ice.
Add vodka, sour apple liqueur, peach schnapps, coconut rum, melon liqueur, pineapple juice, lime juice, simple syrup, and green food coloring.
Shake well (10–20 seconds) until chilled.
Strain into a prepared glass filled with fresh ice.
Fill a syringe with lemon-lime soda and a drop of green food coloring (if using).
Insert the syringe into the drink.
Garnish with a lime wedge or green candy.
Let guests inject the soda into the cocktail for a fizzy burst!