In 4 1/2 to 6- quart slow-cooker, combine water, carrots, celery, onion, bay leaves, thyme, 4 teaspoons salt and 1/2 teaspoon pepper. Place whole chicken on top of vegetables. Cover slow cooker with lid and cook as manufacturer directs on low setting 8 to 10 hours or on high setting 4 to 5 hours.