TT's and most importantly drinking during them is a very personal thing. I drink a bottle while warming up and heading to the line but don't drink anything during a 40k. Lots of time is lost by reaching down and also the drag of the bottle its self.
As for the "look at the pros and do what they do" that is a load. Pros are working within UCI constraints and we mortals are not. RacerEx and DRWJO both run positions that would not be legal for a pro but are much more aero than a uci position. Work within your own morphological restrictions and get YOUR best fit not copy a pro.