Fix it: You can rub an antiperspirant on the bottom of your feet and between toes. It's also a good idea to dab your feet with an antifungal powder, which will help keep your tootsies dry. At night, dunk feet in a bacteria-killing bath of 1 part vinegar and 2 parts water. You could also try a black tea soak for about 30 minutes. The tannins kill bacteria and close up pores, which keep your feet dryer, longer. You'll see results in a few days to a week.
I was curious about the part that I bolded, because I thought that it was an interesting idea... but it also seemed to me that you'd end up with dark/stained feet in the process...??