Combine 1 gallon of water, 1 ounce of vinegar, and 3 to 4 pounds of bones and tissues in a large vessel.
Bring it to a boil and reduce to a simmer.
Add vegetables, spices, and herbs to build more flavor.
Simmer for at least a few hours, though 10 to 24 hours would provide the best results.
Add more water periodically and stir occasionally.
Pull out the liquid by the cupful or strain out the bones.
