If you just particularly want to go to "just water", I can see no problem for a day or two. Expect your energy level to decrease drastically and plan accordingly. Follow the standard break procedure until digestion is fully reestablished.
I would not recommend multiple swfs. One a day will do 'er! If you are still concerned about accumulated gunk, consider a series (three for most ordinary human beings) of professional colonics. That is really the ticket.
Whatever you choose to do, you've done excellent work! Congratulations.