Save my kitty

My little 6 toed kitty, Simon, needs his tail amputated or else he will end up getting an infection in his bones. He's still pretty young and I rescued him and took him to my grandmas but poor baby was attacked by a coyote. Luckily he's still alive for now. He's a special survivor so I really hope this helps because I don't know what else to do, at this point, we completely do not have the money to go through with his amputation.