The entire week? If that's the case that sounds reall iffy. I've always heard you cut the water out a day or two from the show. Seems like if you are drinking so little for that entire week your body will be trying to hold onto as much water as possible and you will not be to flush out the water for show day, not to mention yah, sounds dangerous.
Obviously, I've never competed though so take that for what it's worth.