You will need a large stock pot for this soup. This recipie has morphed from the original (which is so old I don't know where I got it from). I don't like a lot of fat in my cooking, but if you don't like 24 oz of evaporated skim milk, you can substitute 36 oz. of half and half. I also reduced the amount of butter from the original recipie from 1/2 cup to 1/4 cup. So if you want it richer, just add more butter or half and half.
The easiest way to get the cooked chicken and the 7 cups of broth is to make your own chicken broth using chicken pieces. However, if you don't have home made broth on hand, just use cooked chicken and canned broth or bullion cubes.