Replied by Ted (Bangkok, Thailand)
Dear Linda: Foot fungus and dry feet don't exists easily as fungus needs moisture for growth. Assuming, you cannot afford it or won't try other remedies, that narrows down only to vinegar soaking the feet for about an hour a day. Then rinse. Extremely laxative cause is often the sign of a deficiency of both bicarbonates and magnesium, so avoiding further would not help.
A magnesium supplement should not use epsom salt anyway since the effects are laxative. A more ideal form of supplements is magnesium chloride or magnesium gluconate or magnesium citrate. Epsom salt at least for me is used for external application. Also baking soda, H2O2 and magnesium are taken on an empty stomach.
One way to do things properly, assuming the body reacts to everything is to check for urinary pH, if it is below 6, then the body needs to be alkaline to recovery from the itchiness, the body's negative response is an inidication of the body's desire to detoxify rather than it doesn't like anything, in event the pH is already below 6.