I have a bad cold and I'm prepping for a long day of plane travel this Sunday. Any advice to help me be less sick four days from now?

This Sunday I start a fairly brutal day of transit that will last about 25 hours total—three plane legs (including one eight-hour leg), a bus, and a train. No possibility of rescheduling; it’s a work trip.

I have a bad cold that started two days ago. As of today I’m well into the sore throat part and I’m just starting the runny-nose part.

I’m getting as much rest as I can (although the huge amount of work and stress I have this week means I’m not getting as much rest as I wish I could). I’m drinking lots of water, avoiding caffeine, and breathing only fresh air (not air conditioned air).

What else do you recommend I do? Thank you for any advice.