Always have what I call a magical ballet spray in your dance bag.

Take a small spritzer bottle, fill it with ¾ rubbing alcohol, ¼ water, and a few drops of whatever essential oil you like.  I like lavender, so that is what I use, but you could also use tea tree oil, lemon, sage, anything.  Spray off your feet after you have finished dancing for the day.  The spray kills odors, gets rid of bacteria, toughens up feet by drying them out and helping to develop calluses and is inexpensive to make. 
Source: Mary Carpenter via Dance Informa

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