>>318
Next time use some variety of tinned tomatoes if you've got them in
you should always, or tomato purée and hot water as a sort of ghetto passata. Since it's a beef stew you can also use beer. These would be the preffered alternatives but if you're going with plain water a heavy slug of Worchestershire Sauce or similar goes well enough with beef and I'd probably be a fair bit heavier handed with any herbs you're using to compensate. Just throwing mushrooms in (left whole if small or in big chunks otherwise, don't fry them or anything first) early on can help a lot with taste if you've got nothing else as can messing around with dried mushrooms or more obscure shit like mushroom ketchup.
If you're a bong bovril or marmite
I assume vegemite will function for ausfags, never tried it will also function as a halfway decent stock equivalent when watered down, but that's functionally equivalent to a less useful what
>>325 says for most people who won't have it just lying around.
I've heard of using vinegar in a stew but I've never tried it. Maybe a very mild variety for acidity is the logic there?