This girl bullied me so I'm going to kick her water bottle into her face.
Are you sure that's a good idea? I mean, you two are in the same class and she already doesn't like you.
It doesn't matter. She doesn't like me, I don't like her and she makes me uncomfortable.
Being upset that she's bullying you is totally normal and it does need some kind of response, but resorting to violence unprovoked is likely just going to make things worse. Defending yourself is one thing but you're going after her and that's wrong. Confront her with your words or talk to someone about it instead.
Do you know how difficult that sounds? I just have to challenge myself though I guess. Can you be proud of me after I do that?
I sure will, I would think the world of you. You can challenge yourself in so many ways in the world. This is the best place to start.