PREPARE APPLE PIE FILLING: In a large mixing bowl combine the sliced apples, and sugar, flour, cinnamon, nutmeg, salt vanilla and water. Toss to mix all together. Pour into the greased pan, and dot with the the 1 tablespoon of butter. Add the topping mixture, and bake in the oven for 35 to 40 minutes until done. Serve warm with ice cream. Enjoy!