Preheat oven to 425 degrees.
Slice apples into thin slices (mandolin slicer works well for this). Place apple slices into a large bowl.
In a small sauce pan over medium heat, melt butter. Once butter is melted, sprinkle flour over butter and stir together.
Once well mixed, add vanilla, cinnamon, nutmeg, water, sugar, and brown sugar. Stir constantly until mixture comes to a boil.
Once mixture comes to a boil, set aside 1/3 cup of mixture use for top of pie. Use the rest of the mixture to pour over apples. Stir sauce and apples until well combined.
Pour apples into prepared crust. Use strips of dough to decorate top of pie. Pour remaining 1/3 of sauce over top of lattice and pie.
Bake for 15 minutes at 425 degrees. Then, reduce temperature to 350 degrees and bake for another 40-45 minutes, or until apples are tender.