Haven't done it for years, but I used to use one of those small cans of chicken and a pouch of instant gravy mix (chicken, probably; I really can't remember for sure.) Now, if I were to do it, I'd probably use a pouch of chicken instead of a can.

In fact, if I were to do it now, I'd probably get one of those Knorr (formerly Lipton) "side dish" rice packets and add the pouch of chicken after I brought it to a boil. It's just simpler than the separate rice and gravy mix process.

(I use freeze-dried meals now, and let them rehydrate in the pouch.)