Use all unsweetened fruit:

1 can fruit cocktail, drained
1 lg. pkg. sugar free instant Jello

Mix Jello in drained fruit. This will be thick. Add:

1 can unsweetened pineapple, drained
1 can mandarin oranges, drained
1 or 2 apples, chopped

Mix well, let set for about 30 minutes and serve.