Look, if you want to make a quick stock from store brought products, just add some bouillon and gelatin to it. If you want a bit more flavor and you have time,

Look, if you want to make a quick stock from store brought products, just add some bouillon and gelatin to it. If you want a bit more flavor and you have time, you can boil the crap out of some mirepoix and whatever bundled herbs you want to flavor it. It's never going to be as good as the real thing, but then again, you're never going to eat the real thing by itself.