Mix gravy, soup, and water in a bowl. Place all ingredients except mushrooms in crock pot. Cook on low 6 to 8 hours. Add mushrooms during the last half hour. Add Kitchen Bouquet to color if gravy is too pale.
Serve gravy over rice or mashed potatoes.
Use 1 can mushroom gravy in place of mushroom soup.
Use cream of celery soup in place of mushroom soup.