There will be very little fat in this stock, so there's no need to skim it.
Ingredients
7 cups water
Backbone and neck from 1 whole chicken
1 small onion, coarsely chopped
1 large carrot, peeled, coarsely chopped
1 large celery stalk, chopped
1 bay leaf
Directions
Combine 7 cups water, backbone, neck, onion, carrot, celery, and bay leaf in large pot; bring to boil. Reduce heat to medium-low, cover partially, and simmer 1 hour. Strain stock; discard solids in strainer. DO AHEAD: Can be made 2 days ahead. Cool slightly. Chill uncovered until cold, then cover and chill.