In a large saucepan, combine the cranberries, apple, sugar and water. Bring to a boil. Reduce heat; simmer, uncovered, for 10 minutes or until tender. Remove from the heat; set aside., In a large skillet, saute the celery, onion, garlic, sage and pepper in butter until tender. Remove from the heat; stir in cranberry mixture and croutons. , Transfer to a greased 2-qt. baking dish. Bake, uncovered, at 350° for 25-30 minutes or until heated through.