1. Preheat oven to 350*.
2. Place the slices apples in a 9 X 13 inch pan. Mix the white sugar, 1 tablespoon flour and ground cinnamon together and sprinkle over apples. Pour the water evenly over all.
3. Combine the oats, flour, brown sugar, baking powder, baking soda and melted butter together.
4. Bake for 45 minutes