NO water for 40k imo. you can deal with thirst for an hour. Just drink lots night before.
Speaking of 40k.. I had state TT champs yeterday. New position on TT Bike and I've only ridden that bike outside like twice or three times in the last year, so wasn't expcting much. New position is super fast for little power so that was good, but my overal power was way down and I paced the course wrong, not realizing there was a tailwind for the first bit out. So it sucked. Got lucky to get third after so many mistakes. First place guy beat me last year by a bigger margin and second place guy is new to the state and a fast track to big things locally.