Use whatever prepared pie crust is safe for your needs. For a gluten-free crust, try Pie Crust, Gluten Free.
Corn Substitutions: Corn is a common ingredient in products. Starch, modified food starch, dextrin and maltodextrin can be from corn. Consult with your physician to find out which corn derivatives you need to avoid. Many corn-free options are available in the US. Find out more about corn substitutions.