I don't know if I can give you my advice, Marionette, since I gave up my fasting after 6 days (for half of an avocado and some home-made Cesar dressing). You have to be very careful. Just in case, if you start feeling really really weak, take an avocado with you - it will cheer you up and will bring a plenty of energy. If it will not seduce you, you will remember my weakness and look at it as your personal victory.
Farr, who didn't go so far, but lost 5 kg (11 lb) in 6 days, water-fasting.