If I have some soup or stew that is nearing the end of the week, I don't want to waste it, so I put it in a pot on the stove and simmer it for a few minutes, let it cool and then put it into a clean container and back into the refrigerator. That way, I can get a few more days to use up the food.
Today, I had some chicken broth, that I had made last week for my husband who was suffering with a head cold, and also some chili. So, I simmered them and now we can use them up! One caveat... I am not an expert on food safety. This is just what I do.