When you get a chance, get some photos of that foot again.
If possible, try to open his beak and get photos of the inside of that too.
Let me ask you this. Your hands reeked of yeast but you were feeling of his breast/crop. Are his feathers wet in that area? Can you spread the feathers apart and look at his skin around his breast and his crop - is there any leaking, pus or wounds on his skin?
Wash your hands really well with warm soapy water. If the odor lingers, then you use a little vinegar or lemon juice to wash your hands in to take out the odor.
As for antibiotics, I do see where Carol (
@azygous ) has suggested those on your other thread. It would not be a bad idea to have some on hand. The dilemma is which antibiotic would be best to use.
I also understand you are running out of time and that funds are tight. We live in a very tough time right now and I think all of us are feeling it. The LA200 may be o.k. to use if that's all you can get. I know TSC also has Penicillin G. BOTH of these are injectable, so you would have to give him an injection just so you know. Hopefully Carol can chime in with her thoughts on this.
I so very much wish I had answers for you and that he gets better. I know it's very distressing for you to see him like this and I hope you know you are doing your best to take care of him and doing a good job.

Talk to your Mom and see if she can help you with washing him up and accessing his crop too.