The essence of turkey gravy is deep, rich, flavorful homemade turkey broth, which can be prepared weeks in advance and frozen in airtight containers. Be sure to leave plenty of headspace in the containers because stock expands considerably when frozen. It might seem silly to use store-bought stock in homemade broth, but it adds flavor and is worth the cost. However, you can use water if you prefer. Use it to make incredible gravy or in soups and stews.