Jill, there is no way to make jarred gravy taste right. Instead, get a
couple packets of gravy base, like French or McCormick makes, make them
per instructions with the water, then stir in some chicken broth and "Better
Than Bouillion" to,strengthen the chicken flavor...taste and adjust as needed,
make a roux and stir that in to make it thicker and make it into a good gravy.
It will be ever so much better than the jarred stuff.

N.