Dry feet are often not just dry, but have tinea. I use 500mls of vinegar (any cheap one will do) mixed with 2 capsful of tea tree oil. When shaken mixture will be cloudy.
Apply this every day. it penetrates into skin quickly, but if you have no spare time, just dry with hairdryer. It has worked very well for me. I have no more dry feet after two weeks of usage.
