Should I throw a drink in my racist aunt's face?
Why would you do that? Did she do something to make you mad?
Hell yeah she did. She talks bad about me and my father because he's black and I want her to pay for treating us like shit.
Being upset in that situation is 100% understandable and you're right but but you shouldn't throw something at a family member, regardless of how unbearable they are. Don't let her words make you violent or you're just playing into her idea of racism. I think the phrase "kill them with kindness" should apply here and just continue to be cordial and make her look like an idiot instead.
What if I don't have time for this and I just want to punish her?
I don't think punishing her by throwing a drink in her face is worth it. It's not right to start a physical altercation with someone. I'm sure the rest of your family realizes that she's saying ignorant things, so there is no reason to stoop to her level.