Safe home remedy to treat possible RI in ball python? Is it too late?

[Sauzo]

I've taken the snake to the vet, a year ago. She told me she was fine and gave me oral antibiotics. Doesn't seem to have worked. I wasted $60.

For $60 I doubt a culture was done. You need to get a culture done to find out exactly the type of "bug" causing the RI so you know what antibiotics will work best if at all. I would not go back to that vet if they didn't even bother to do a culture. Doesn't sound like a good vet imo. Call around and find one that is more into reptiles or check with your local herp society on who they have check their reptiles and adoptions. A good vet also wont be cheap. Harley got mild RI a couple years ago and it ran me about $270 to get everything done. I did tell the vet I wanted a full blood work up done too though it was her first time into the vet. So without that, it still would have run around $170. A good herp vet is not cheap but is very valuable imo.