Preheat the oven to 350 degrees.
In a small bowl combine the brown sugar, flour, cinnamon, and salt; stir to combine.
Place the apples in a greased, shallow baking dish.
Sprinkle that dry mixture over the apples.
Drizzle the water over the top.
In a large bowl, combine the cake mix, oats, butter, brown sugar, baking powder and baking soda.
Sprinkle that mixture on top of the apples.
Bake 45-50 minutes or until golden brown and bubbling.
Serve with warm with ice cream on top.