Arrange one of the pie crusts into the bottom of a deep dish pie pan.
Fill the pie shell with the apples.
In a medium pot, whisk together sugar, flour, salt, water, and apple cider vinegar.
Cook over medium heat, stirring constantly -- don't neglect to stir!, until thick and syrupy, about 4-5 minutes. Mixture should coat the back of a spoon without easily running off.
Remove from heat, and add butter, vanilla, cinnamon, and apple pie spice, stirring to combine.
Pour mixture evenly over the apples.
Arrange the top crust, pinch edges to seal, and prick a few times with a fork.
Bake at 400 degrees for 45-50 minutes, or until top and edges are golden brown. Rotate pie 180 degrees halfway through baking.
Remove to a wire rack to cool.
Serve with ice cream or whipped cream.