Variation:
If you have cooked a crockpot chicken, keep all of the drippings and vegetables in the pot. When you are done eating, add the bones back to the pot along with a fresh onion or two, fill with filtered water and 2 tbsp of vinegar and cook on low for 24 hours. I do this a lot when I make a whole chicken. Your broth will take on whatever flavors you used on your chicken, which is usually a delicious thing!