1/2 cup lime juice
1/2 cup fresh mint leaves
1/4 cup granular sucralose sweetener (such as Splenda®)
4 1/4 cups diet lemon-lime soda
4 cups crushed ice
Stir lime juice, mint leaves, and sweetener together in a pitcher; gently crush and bruise mint leaves with a wooden spoon.
Pour diet lemon-lime soda into juice mixture and stir until sweetener has dissolved.
Mix in crushed ice to serve.