01 -
Place chicken bones in a 6-quart (or larger) slow cooker.
02 -
Add enough water to fully cover the bones, leaving at least 1 inch of space at the top.
03 -
Add apple cider vinegar and salt, if using.
04 -
Cover and cook on low for 12-24 hours. Longer cooking time results in a richer broth.
05 -
Turn off heat and let the broth cool slightly.
06 -
Strain broth through a fine-mesh strainer or cheesecloth into a large bowl or container.
07 -
Discard the bones, let the broth finish cooling completely, then refrigerate.