HELP! Hot Yoga in the Morning

Hello, I have fallen in love with Yoga after doing it for the first time on Sunday. Somehow the owner of the school convinced me to sign up for Hot Yoga tomorrow. I'm scared to death as I'm not a huge fan of heat. With me having the RnY I am wondering what I can and should eat tomorrow morning before Hot Yoga? HELP! Any advice would be great. I don't want to pass out in the middle of the class!