Fry bacon until crisp, drain fat and reserve 1/4 cup (discard remaining fat). Sauté onion, celery, cranberries and apples in the reserved fat until onion is slightly tender. Mix bacon and sautéed ingredients with the bread and add enough stock to moisten bread. Put in a casserole dish, cover with foil and bake at 375°F for 30-45 minutes or until stuffing is heated through and edges start to crisp.