Baking Soda and Vinegar Soak Baking soda is not fungicidal-that is, it does not kill the fungus. It is, however, fungistatic, which means it can prevent fungus from growing and spreading.environment in a harmful way. 4-5 tablespoons of baking soda -1 cup of white vinegar or apple cider vinegar -Water -Something to soak your feet in -Paper towels