Water ?!?

On Day 4 Here ... I have a question on water ... I held off until I got my $2 Master Cleanse book in the mail, but it wasn't covered ... Are we supposed to be drinking the regular (8-10 cups) of H20 in addition to the lemonade? I had assumed that lemonade and peppermint tea were IT ... and then somebody posted that dehydration could be a reason for having trouble with the SWF (Salt-Water-Flush) (which went much better today, whew!) The again how can water hurt, right? Anyway, what's the deal with Master-Cleanse Hydration?