Prepare cake batter, according to package directions. Spread batter into a greased 9x13 inch baking pan.
In a separate medium bowl, add dry pudding mixes, granulated sugar, milk and water. Whisk together for 2 minutes. Pour pudding mixture evenly over the top of cake batter. (Don't spread.)
Bake cake for 55 minutes to 1 hour, or until toothpick inserted in center comes out clean. (My cake took 1 hour and 3 minutes to fully bake.)
Carefully remove cake from oven. Let stand and cool 20 minutes before slicing. The pudding will thicken as it stands.
Serve each slice with fresh whipped cream, ice cream or whatever you desire. Enjoy!
Notes
Cover and refrigerate any leftover cake for up to 3 days.