In a medium bowl, using a pastry blender, cut the 1/2 cup cold butter into the first 1 cup flour until pieces are pea size. Sprinkle 1 tablespoon of the water over part of the mixture and gently toss with a fork. Push moistened dough to the side of the bowl. Repeat, using the remaining 1 to 2 tablespoons water, until dough is moistened. Form dough into a ball. Divide in half.