Cut cold butter into flour and salt, until it resembles small pea-sized balls. I like to use my fingers because it slightly warms the butter. Add the water by sprinkling in slowly, stirring between each sprinkle. Once the dough is hanging together, divide into two balls. Roll out a bottom crust and lay in a 9" glass pie pan. Fill with berry mixture. Roll second crust and lay on top. Moisten the seam with water, trim the edges and crimp together.