Shooting in high humidity?

Hi all, I had a quick question about dealing with humidity and foggy lenses. I found myself at the beach where the humidity is significantly higher than what I, and evidently my camera is used to. I've seen some people suggest getting hand warmers but the beach I am at is a bit isolated and doesn't have that kind of stuff, or really much for sale that could produce heat.

Is there a way to stop my lens from fogging up or to clear it up as quickly as possible?

Thanks!