I read that over the counter medications, kept in a stable environment, away from moisture (not in bathrooms) can last a long time.
It is evidently, not in the interest of pharmacists, to publish that.
Nasty fungus are everywhere, this is why long pants, long travel dresses or a sarong and closed toes hotel slippers should be favored.
Convertible pants or clothes (there was a link about a tube and other clothing, that could be worn many different ways.
Airports, train. bus, tram stations and stops, malls/shopping centers, museums, libraries and hotels being public places are all prone to carry and transmit nasties.
For people with allergies and sensitivities, a first aid kit is a must.
Baby aspirin is also good.