While you can probably find boxed turkey stock at your local grocery store, it's easy to make a homemade version to use for things like soups, a rich gravy, and casseroles. 1. Place a turkey carcass with 2 large onions, 4 chopped celery stalks, and 4 chopped carrots in a stockpot. Cover with water and bring to a boil. 2. Reduce heat and simmer for 3 hours. 3. Remove the bones, then pour the stock through a strainer into a large bowl. 4. Cool completely and divide into containers. Refrigerate for up to 1 week and freeze for up to 3 months.