Prepare the Oven and Pan: Preheat the oven to 350 F. Butter a 1 1/2-quart baking dish.
Prepare the Apples: Peel and core the apples and slice them into thin wedges.
Arrange the sliced apples in the prepared baking dish. Pour the water over the apple slices.
In a bowl, combine the flour, brown sugar, cinnamon, and salt. Cut the butter into the flour and sugar mixture until it resembles coarse crumbs. Sprinkle the crumble mixture over the sliced apples.
Bake the dessert for about 35 to 45 minutes, or until the apples are tender.
Serve the apple crumble warm or at room temperature with ice cream or whipped topping. Enjoy!