It is OK, but just don't add things like salt (and never include onions!). But just a small amount of water is fine as well.
I homecook for Henri when I'm going to be travelling and he goes to his petsitter (it's simpler than asking a family with small kids to feed raw LOL). For that, I just make a big stew of meat (chunks), ground beef (for the fat content), liver, kidneys and some vegetables. I only use enough water to stop it sticking to the bottom of the pot and the offal adds all the flavour he could possibly want - stock isn't really needed.