Pull the meat off the roasted chicken and reserve for another recipe (such as The Best Chicken Vegetable No-Noodle Soup). - Link to this recipe
Put the water in an 8-quart stockpot over medium-high heat. Add the roasted chicken bones, chicken backs, chicken feet, kombu, vinegar, bay leaves, and 1 teaspoon of salt.
As the water comes to a boil, add the onion, garlic, ginger, cumin, turmeric, asafetida, and celery. Cover the pot and reduce the heat to low. Simmer for 18 to 24 hours.
Use a colander and large bowl to strain the broth. Discard the bones and vegetables.
Transfer the broth to several quart-size mason jars, leaving 3 to 4 inches of space at the top of each jar. Add a pinch of salt to each jar before securing the lid.