Some years ago when I had a lot of tomatoes and peppers in the garden I decided to make homemade picante sauce. All of the stuff in the stores has a lot of vinegar and I don't like vinegar in hot sauce. I found a recipe and it called for chicken stock as a base. Came out great. Made 4 jars and they were gone in 2 weeks.
If you don't know what to do with it, get a bunch of those bathroom paper cups you use for mouthwash. Fill each with 1/4 cup of stock. Freeze and then store in gallon sized freezer bags for later. When you want a little liquid in a sauce or to add moisture to various dishes, you can just grab a 1/4 cup at a time and toss it in the pot.