HEAT oven to 350 degrees. Prepare cake batter as directed on package. Pour into 13 x 9-inch baking dish sprayed with cooking spray. Beat dry pudding mixes, sugar, milk and water with whisk 2 min.; pour over batter. Place baking dish on baking sheet. Bake 55 min. to 1 hour or until toothpick inserted in center of cake layer comes out clean. Cool 20 min. (Sauce will thicken slightly as it cools.) Spoon into serving dishes; top with Cool Whip.
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