1 1/2 quarts pineapple juice
1 quart apricot nectar
13 fluid ounces vodka
13 fluid ounces apricot brandy
1 (6 ounce) can frozen orange juice concentrate, thawed
1 (6 ounce) can frozen lemonade concentrate, thawed
1 (2 liter) bottle lemon-lime soda (such as 7-Up®), or to taste
Mix pineapple juice, apricot nectar, vodka, apricot brandy, orange juice concentrate, and lemonade concentrate in a large pitcher or bowl.
Store in freezer, stirring periodically, until a slushy consistency is achieved, 4 to 6 hours.
Ladle slush into large glasses; top with lemon-lime soda to serve.