Supliments like a good multivitamin and pro/pre biotics are a great addition as well
Healthmasters.com
Im pretty sure you can get antibiotics online now too
It’s much more difficult to get antibiotics online these days. Over the summer, I had to purchase some for my dog through a Canadian website as the government is cracking down on online pet shops selling them. I paid about $100 for them, not cheap but cheaper than sedating my German Shepherd for a vet visit.