Preheat the oven to 400°F. Roll out one pie crust. Place the crust on a 9-inch pie plate, gently pressing the dough into the bottom of the plate. Trim and crimp the edge and set aside.

In a large bowl, combine the pumpkin, sugar, salt, ginger, cinnamon, and flour. Add the eggs and mix well. Stir in the evaporated milk, water, and vanilla. Pour the mixture into the pie crust and bake for 45 to 50 minutes, until a knife inserted in the center of the pie comes out clean. Serve at room temperature.