Best fasting strategy for candida is green juices. You can rid your body of the evil yeasties this way, but it's tough as it means no sweet stuff. One fruit is allowed in small quantities: Granny Smith apples. Even carrots contain loads of sugar, which is why green juices are stressed.
An easier way might be to go on a candida diet, which pretty much means green apples (small quantities) and vegetables, mainly green, for 4-6 week, in conjunction with an herbal candida cleanse, available at good health stores. Your body will definitely scream for carbohydrates (which is what the yeasts feed on), but starving them out will get results.
There is a juice fasting forum where I have posted lots of juicing tips.