Place chicken and all other ingredients into large (16 quart) stockpot. Add 6 quarts water. Bring to a boil, then reduce heat to simmer. Cook partially covered for 1-1/2 to 2 hours, until the chicken is fully falling off the bones. As it cooks, skim off foam or impurities off the top.
Set aside until slightly cooled. Remove as many solids as possible with tongs and discard. Strain the remaining liquid through a sieve and throw away any remaining solids.
Transfer liquid to storage contains. Cover and refrigerate up to one week or label and freeze for up to 3 months.