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@Brommers
Weeeeell, and yes, I can see where you're going here (internal drinks bottle), let's say the TT has the same width as the DT and ST (24.8mm) and has a half-inch depth (12.5mm) and is 530mm long. If the tube is a perfect elipse then the cross-sectional area is 12.5 x 24.8 x pi = 973.71mm2, giving a total volume of 516k mm3, or just over half a litre.
The difficulty in using the TT as a drinks bottle would be getting the fluid from the TT into the rider's mouth. The aero testing I've seen on BTA drinks bottles shows that straws poking up from BTA bottles are horribly un-aero, and I'd assume the same would apply to anything poking up from the TT.