What should I bring to my sister's softball tournament?

My sister has her first softball tournament tomorrow. It's two days long, 4 hours away. We are the same age (13) so what should I bring for the car and for her games (she has 3 games tomorrow, and 2 on Sunday)? I used to play softball and I know I'll have to videotape and stuff. There will be a double header and then like 4 hour break until the next game starts.