Here's a water bottle that I made for TT. Now, I can drink without breaking my aero position, which supposedly saves about 9 seconds in a 40k (I didn't do that science myself, but it sounds reasonable). Be patient with the sound quality. I don't know why the volume is so low in the beginning.

http://www.youtube.com/watch?v=d_XzTWJ1BTU

I'll be doing this with an aero bottle next.