Add just enough cold water (a few tablespoons at a time) to get the dough to form a ball.
Divide into two halves, and roll out the two crusts.
Assemble and bake as per the recipe you are using.
Notes
How much water is actually needed will depend on how dry your flour is, the humidity in the air that day (sic), etc.. You may need a bit more, you may need a bit less.