Bones from 1 chicken
including tops coarsely chopped
apple cider vinegar
Place the bones in the slow cooker.
Add remaining ingredients.
Add enough water to your slow cooker to fill it three-fourths full. (Do not fill more than three fourths. Your slow cooker will not work correctly if you do.)
Cover slow cooker and set to low.
Cook for 8 to 12 hours.
Strain into freezer safe jars, leaving one-inch headroom.
You can freeze for up to 6 months.