ADD 1 cup boiling water to each flavor fruit gelatin mix in separate bowls; stir 2 min. until completely dissolved. Pour each flavor of gelatin into separate small shallow food storage container sprayed with cooking spray. Refrigerate 2 hours or until firm.
SPRINKLE unflavored gelatine over cold water; let stand 1 min. Stir in remaining boiling water. Add condensed milk; mix well. Cool slightly.
CUT flavored gelatin into cubes. Randomly place cubes in 13×9-inch pan sprayed with cooking spray. Pour milk mixture over cubes; stir to evenly distribute gelatin cubes. Refrigerate 2 hours or until firm before cutting into bars.