Homemade Chicken Stock

Name: Homemade Chicken Stock
Prep time: 10 min
Cook time: 4 h 30 min
Total time: 4 h 40 min
Cuisine: American
Ingredients: 2 rotisserie chicken carcasses (picked, but not cleaned); 4 medium yellow onions; 6 medium carrots (chopped); 8-10 celery stalks (chopped); 12 cloves garlic; 4 bay leaves; 16 sprigs fresh thyme; 2 sprigs rosemary; 2 teaspoons whole peppercorns; 4 teaspoons sea salt (more to taste); 20 cups cold water (or enough to almost cover the chicken)