Mix the flour and the salt. Work in the shortening with a pastry blender or two knives or forks or whatever you have. Put it in a covered container or a large zip lock bag and keep it in the cupboard until ready to use. One cup will make one crust. If your pie has a bottom and top crust (like an apple pie) this will count as two crusts. Add water 1 Tablespoon at a time and stir with a fork until the dough will form a stiff ball. Then roll out on a floured surface. Always put your rolling pin down in the middle of the dough and roll out toward the edge. This keeps the dough from splitting at the outer edges.