In a medium bowl, whisk together the flour and salt. Add the shortening and cut it into the flour mixture using a pastry blender. The flour mixture should be in pea-size granules. Add the water, 1 or 2 tablespoons at a time, mixing well until a ball of dough forms.
Knead the dough gently using excess flour to keep it from getting sticky. Roll it out with a rolling pin on a floured surface. Place the dough in a 9-inch pie plate and crimp the edges. Set it aside.
MAKE THE APPLE FILLING:
Preheat the oven to 300°F.
In a large bowl, combine all of the apple filling ingredients and pour the apples and all the juices into the unbaked crust.
MAKE THE STREUSEL TOPPING:
In a small bowl, stir together the brown sugar and flour. Add the softened butter and mix it in with your (clean) fingers or a fork. When you get nice-sized bits of streusel topping, sprinkle it on the pie. Add a little extra butter in little chunks on top, if desired.
Bake for 30 to 40 minutes, or until golden brown.
Notes
For best results, use a mix of Granny Smith, Jonathan and Pippin apples.