Soup peddlers guide to slow and difficult soups It is awesome.
I always just throw any veggies I have in chicken stock with chicken breast.
My staple would be onions and garlic fried in a little oil, add some red / green peppers, courgette, carrot, celery, and a tin of chopped tomatoes, chicken stock.
Make your own stock! Keep a Tupperware in the freezer for bones.