2 (12 ounce) cans coconut-flavored sparkling water (such as La Croix®)
12 fluid ounces diet cranberry juice drink (such as Ocean Spray®)
1 lime, juiced
1 lime, sliced (optional)
Stir coconut-flavored sparkling water, cranberry juice drink, and lime juice together in a pitcher.
Fill glasses with ice cubes. Pour sparkling water mixture over ice; garnish with sliced lime.