Oh heck, I bring everything since Florida does something weird to my allergies, probably since Montana is so much drier than Florida. I'm bringing Zicam meltitabs, Airborne, Claritin-D (for me), Zyrtec (for DN), sinus headache meds, and coldeeze lozenges. They have like nyquil, regular cough drops in the gift stores (unfortunately, I know). Zicam usually works just as well for me as nyquil or sudafed.
At least DN is on penicillin NOW so hopefully that'll carry over to the trip a bit and she won't pick up anything.
I've been washing my hands like a fanatic hoping not to pick anything up.