1 (6 ounce) package pineapple-flavored gelatin mix (such as Jell-O®)
2 cups boiling water
1 (16 ounce) can pineapple chunks in juice
6 fluid ounces strawberry vodka
4 fluid ounces banana rum
1/2 cup cold water
20 mini plastic cups
Stir pineapple gelatin into a bowl with boiling water until dissolved.
Drain pineapple, reserving 1/4 cup of juice. Pour juice into the gelatin mixture; add vodka, rum, and cold water. Stir well.
Place 1 pineapple chunk in each cup. Pour the gelatin mixture on top. Refrigerate for 1 hour. Freeze for at least 30 minutes before serving.