Here's my trick for dry feet in camp:
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A) I take off my shoes and socks and dry my feet as best I can.
B) I will SOMETIMES take a pair of extra insoles, really light and thin ones, and I'll put these in my shoes (after removing the wet ones) extra weight, I know.
C) I put dry socks on my feet.
D) I put plastic produce bags over my dry socks.
E) I put this whole rig back in my damp shoes.
CONCLUSION: As long as I just hang out and don't walk to far, this system works pretty good. It ain't perfect, but it sure is light.
ALSO: I work as an instructor for NOLS, and we don't allow open toed sandals (like flip flops) on most of our courses. We have seen too many minor foot injuries turn into creepy infections (really, we have 40 years of data to back this up) and I truly believe in this as a way to insure foot safety. Yes, it's strict and dogmatic. But I have been out there (way out there) and seen some students in pain because of a mis-step without shoes.
IF YOU DO USE THOSE CUTE HOME-MADE FLIP-FLOPS —- (please) BE CAREFUL!