PS - Sav-a-Chik makes a probiotic powder you add to their water for under 3 dollars. They have it at Tractor Supply and Walmart here in my area.
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Actually I have an antique pastry plate (the only one left out of a collection I once had) that is hand painted that I use. If formal service would help any of them in any way to be healthier I would, of course, go all out....as would you I know. Crystal, silver flatware, chandeliers, the whole bit...maybe even a violinist playing in the background.I had to laugh, do you also have to drape a white towel over your arm when serving it it them in their lil dish?
And a singer singing O So lo me o [spelled wrong] but you get my drift.Actually I have an antique pastry plate (the only one left out of a collection I once had) that is hand painted that I use. If formal service would help any of them in any way to be healthier I would, of course, go all out....as would you I know. Crystal, silver flatware, chandeliers, the whole bit...maybe even a violinist playing in the background.
I do too can't say enough good things about ACVWe had success with 1 Muscovy who was coughing. Added a splash of apple cider to drinking water and it cleared up. We always add a little to drinking water now.

I wouldn't mix the ACV and antibiotic in the same bowl but if your giving her her antibiotic by mouth then put the ACV in her drinking water.Be extremely careful with the continued use of antibiotics. After a while there is always the risk of a superinfection:
"Superinfection is the process by which a cell that has previously been infected by one virus gets co-infected with a different strain of the virus, or another virus, at a later point in time.[2] Viral superinfections may be resistant to the antiviral drug or drugs that were being used to treat the original infection. Viral superinfections may also be less susceptible to the host's immune response."
So, at this point I would strongly suggest that you consult with a second vet about any additional medication for the treatment of your bird. If there is not an avian vet in your area call around and find someone with at least some knowledge about bird diseases.
As for ACV use while on medication I am not aware of any conflict between ACV and antibiotic use...but I am not a vet or a chemist so you might want to ask someone who knows.