In a mixing bowl, stir together 2 cups all-purpose flour and 1/2 teaspoon salt. Using a pastry blender, cut in 2/3 cup shortening until pieces are pea size. Sprinkle 1 tablespoon of cold water over part of the mixture; gently toss with a fork. Push moistened dough to the side of the bowl. Repeat moistening dough, using 1 tablespoon cold water at a time, until all the dough is moistened (6 to 7 tablespoons cold water total). Divide dough in half. Form each half into a ball.