I would keep it light. Bagel or other bland food that you know won't upset your stomach. I take Bonine about a hour before and I am fine on the ride. If I feel a little queezy, I close my eyes for a minute, and that seems to help. I am a ride weenie, and absolutely have to take motion pills every time we visit. They don't make me sleepy, and I don't drink alcohol while using the pills, and hey really help with the sickness I get with motion. Did the Simpson's ride, the mummy, spiderman and coasters. I would not have done any without medicating first.
I thought FJ was as rough as indiana jones at DL, and up and down like the ToT, but not feeling like a yo-yo, more like a jerky back, forth, up, down.