Wrong book is wrong.
That's not how you deal with a problem like that. You really need to get an adult involved. You don't want to end up in a situation where the bully is actually violent with you. There are only threats in this story, but kids aren't going to come up with the solution to bullying on their own. This whole book is a bad idea. Don't do this.
Message
People will stop bullying you if you trick them into eating something yucky.