I have an old hen-13 years-that has sour crop. I feel awful because she has had it for days and I just thought she was naturally on her way our with the colder Fall temps and such. Anyway, I researched threads here, and gave her 1/4tsp of organic unfiltered cider vinegar. Now it says to give her only ACV water for next 12 hours. Do I just put it in her cage, or force it to her? She did puke up a bunch of goo with grass and such-like a ton actually. She still has a bit of a puffy feeling, but nothing like it was. Will the ACV help boost her energy? She is already old and thin, and I'm not sure she can make it through-I sure hope so.