Combine fruits and lemon juice in bowl; toss to coat.
Cover and refrigerate.
Sprinkle gelatin over cold water, and allow it to rest 5 minutes to soften.
Heat just until gelatin is completely dissolved.
Add gelatin and sugar replacement to fruit; toss to coat.
Fold topping into fruit mixture.
Spoon into mold, freezer tray or individual dishes.
Freeze until firm.