In a medium bowl mix together cake mix, brown sugar, and cinnamon. Stir in melted butter or margarine until ingredients are thoroughly blended; mixture will be crumbly. Sprinkle mixture over apples.
Arrange apples in an even layer in bottom of baking dish. Pour water over apples.
Preheat oven to 350 degrees F (175 degrees C). Lightly grease a 9x13 inch baking dish.