Preheat oven to 350 degrees.  Lightly grease a 9x13-baking dish.
Arrange apples in an even layer in bottom of dish. Pour water over apples.
In a medium bowl mix together cake mix, brown sugar, and cinnamon.
Stir in melted butter until well blended.  Mixture will be crumbly.
Sprinkle mixture over apples

Bake in preheated oven for 50 to 55 minutes.