I read on Dr. Biamonte's site that he thinks a 30 day Water Fast might cure candida. (see his FAQ) He claims to be an expert on candida, though his program does not include fasting. I do week long veggie juice fasts. They help my digestion some but obviously haven't cured my candida.
Generally a 30 day fast isn't recommended. For most ailments experts seem to recommend shorter fasts. But given the nature of candida perhaps a 30 day fast would be the way to go.
But I think that a 30 day fast would be far too difficult. Other ways must be easier. And one must be careful with fasting as with any other extreme measure. I believe that my two years as a raw vegan lead to my candida in the first place.