If you don't have a medicated foot powder at home you could use baby powder, or cornstarch instead. I had fungus on my two big toes only. It can become quite deadly and extremely painful.
The drug is branded in the market as Sporanox.
Also your feet tend to be subject to a lot less oxygen because they are cooped up in your shoes and socks all day. At any strength, large amounts of hydrogen peroxide can be dangerous when the liquid comes into contact with the eyes or lungs.
Be very fussy about the instruments that are being used on your feet.
One treatment that has gained popularity among nail fungus sufferers is Zetaclear nail fungus treatment which makes use of natural substances and promises to give a potent cure for nail fungus. The work has shown that a variety of fungi and yeast that cause infection in humans are killed when exposed to tea tree oil.