Here are few tips:
Clean and thoroughly dry your feet daily and expose them to the open air as much as possible.
Use cotton socks so that your feet can breath and change your socks everyday.
Wear well-ventilated shoes made from natural rather than synthetic materials; open-toed sandals are particularly good.
Use a separate towel just for drying feet, and wash the towel frequently.
Eat plenty of fresh vegetables, lean proteins, and whole grains these food will support immune system and feed healthy bacteria.
Drink 8-10 glasses of water a day to assist in flushing out toxins.
Soak feet in a very warm solution of one part of white vinegar to four part of water for 20-30 minutes twice a day.