I have a sick 8 month old cat with fever. I took him to the vet and he got a

[I'll Never Tell]

shot. He was prscribed? amoxiccilan twice a day,half a cc twice a day. he's gotten worse. We spent 400.00 at the vet already in the last week and a half for other cats too and can't afford to go back right now. I bought pedialyte and giving it to him every 2 hours and bought some cat vitamin paste. Is there some super cat food I could make at home to get his immune system up. He can barely walk and I've been feeding him with an eye dropper cause he's very weak. Any advice would be helpful. Any herbs?