I didn't vomit during labor/birth either... Lots of fluids (and bendy straws), water, coconut water, tea... I have a doula friend who has a "sip of fluid after every contraction" rule.
Light snacks - veggies, fruit, something you enjoy and digest easily.
Be prepared for the fact that you might be hyper-sensitive to smells during labor, and you may vomit (especially during transition).
Also, check out some of the "crunchier" expectant mother sites, there are whole threads on this. :-)