To prepare the crust, combine the flour, salt, and sugar. Using a pastry blender, cut in cold butter and shortening until combined to pea sized. Add 3-4 Tablespoons water and mix; continue adding the remainder of the water just until crust is combined. Form into a disc, cover with plastic wrap, and refrigerate for at least 30 minutes.
Pre-heat oven to 375°F. Toss apple slices with water, cinnamon, and sugar. Set aside.
Mix topping by combining flour, sugar, salt, and cubed butter with a pastry blender until roughly combined.
Roll out crust to the size of your pie dish; trim and crimp edges. Add apple mixture into crust and top with the crumble topping. Bake for 45-50 minutes until bubbly and golden brown. *It's recommended you use a tent around the crust edges to prevent them burning; I generally have it around the pie for the first half of the baking time as needed.