Drain pineapple, reserving juice in 2-cup microwavable measuring cup; set pineapple aside. Add enough water to pineapple juice to measure 1 cup; microwave on High 2 minutes or until boiling. In large bowl, pour boiling liquid on pineapple gelatin; stir until gelatin is dissolved. Stir in remaining 1 cup cold water and reserved pineapple tidbits. When orange gelatin layer is set, carefully pour pineapple gelatin over orange gelatin layer. Refrigerate at least 2 hours or until set. Unmold on serving plate. Cover and refrigerate any remaining gelatin.