Lamisil Once, not cheap £10 ish, small tube use on both feet up to ankle if there is any left when you've finished you haven't used enough. or anything with Amorolfine or terbinafine in it
Pot Permang as mentioned.
Powders are only any good as a preventative, no good when you've got it. don't use talc, its porous and is a good breeding ground for nasties. Baking powder/Bicarb better, when damp, from perspiration, it breaks down giving off weak carbolic acid (most foot powders contain it).
Cool washes for socks and the spores survive, hot washes(60 c +) and your socks shrink. There are new washing powders that will kill spores (allegedly) best to ditch socks when you are clear.
Fungus likes warm damp dark places, get your feet out and aired where possible