1 1/4 cups cold coffee, divided
1 envelope low-calorie hot cocoa mix
ice cubes, or as needed
1/2 cup unsweetened almond milk
2 tablespoons sugar-free chocolate syrup, or more to taste
Heat 1/4 cup coffee in microwave in a mug until warmed, about 30 seconds. Stir cocoa mix into the coffee until dissolved.
Fill a large glass with ice cubes. Pour 1 cup cold coffee and almond milk over the ice cubes; stir the cocoa mixture and chocolate syrup into the coffee and almond milk.