Along with the link at the top of this page, you can also google for it -- there are bucket loads of information available on the Master-Cleanse including the 100% free manual in it's full text (I don't have the link handy, but googling will get you the result on the first page). Along with that, this forum (and it's archives) are chock full of information (and great support!), and it's always recommended to also do the self-study (reading the manual, it's the length of a booklet) to help make the best decisions for your health.
IMHO, the Master-Cleanse is much more complete as our bodys continue to require energy supplementation during a fast. This may be a dumb question, but is there no preparation for a water fast?
I'm glad your friend recommended the MC! I'd recommend it too =) I hope you have a little time to spare to read over the manual to help in your decision and hope we see you back here again! Much luck and health either way!