I have faced nasty morning sickness and here are the things that helped a great deal:
Ginger Tea - Take a bit of ginger root, grate in a mug and then add hot water and steep for three minutes. Add a bit of honey and then drink.
Arrowroot Cookies - They sell these in the baby food section. They are small cookies made with arrowroot, and along with ginger tea, this was my breakfast of champions.
Altoids Ginger Mints - The only place that carried them in our area was Target, but you can order them online. They have real ginger and helped to settle my stomach and get that weird taste out of my mouth.
Eat 5-6 small meals per day, not 2-3 large ones. Generally a meal for me would fit on a saucer for my tea cup, but if I kept eating these small meals and sucking my ginger mints I could function.
I could not drink plain water for about 4 weeks, but I could drink water if I put slices of cucumber in it. I left a pitcher of Brita water with cucumber in the fridge at all times, so I could stay hydrated.
I can't eat meat or eggs during about six weeks of my pregnancies due to "all day" sickness. I could eat just about any fruit, vegetable, or bread as long as it wasn't deep fried. For protein, I did beans and rice, usually once a day.
So, at the World, I would suggest you keep hydrated, however that works for you, avoid caffeine, take breaks during the middle of the day. Keep some food in your room so you can have "first breakfast" when you wake up in the morning.
Oh, I forgot, I also wore sea bands while preggers. They help with motion sickness via accupressure. My doctor suggested it, and they really helped.
I am sending you a big dose of

magical pixie dust and a few prayers.

Keep us posted, and I bet you will have a wonderful Disney vacation.
We are leaving in one week as well, so I may see you there. We are in Pop.