My kitten is unable to eat, how can I feed him?

I would definetly switch to a wet food mix. Much easier to digest and mix with water. I would have beat the kid within a inch of its life if that was my cat but I would try a different vet. It sounds like it needs to have its jaw wired and repaired. He needs X-rays...I am sure that first vet missed alot of stuff. I would actually report him to the vet board for review if your cat actually has broken bones and all he did was give it shots. Get it to the vet quick.