Buying a rotisserie chicken and throwing it in an instant pot with some carrots, onions, celery, and enough water to cover it (and some thyme, rosemary, and bay leaves) for an hour or so has surprisingly good results, and is fairly easy to do. Pour the liquid through a strainer. I pour it into ice cube trays and freeze it, so I can just grab a couple of cubes when I'm making a pan sauce or soup.