Combine the flour, salt and sugar in a large bowl. Using two knives, a pastry cutter or your fingers, cut the shortening into the dry mixture until the mixture resembles a coarse meal.
In a measuring cup, combine the water and milk. Add the liquid a little at a time to the flour while mixing with a fork. Keep adding liquid until a dough comes together and forms a ball. You may not need to use all of the liquid. Form the dough into two disks and wrap each in plastic. Chill in the refrigerator for at least one hour before using.
The dough can be made up to two days ahead and kept in the refrigerator.