In any t de f or t of b event when a rider has emptied his bottle content can he the be supplied with fresh bottle or can this only be done at the feed station / zone?

Yes strange one I know.

Any time up to the last 10k

So feed stations are for food rather than drink if you know what I mean?

They can collect bottles/food from the team car anytime after the first 50km and before the final 20km. That means dropping back to the team car so if the car is towards the back of the convoy, they may just choose to wait until the feed zone which is at a set point somewhere in the middle of the stage.

That’s what the domestiques are for
http://www.youtube.com/watch?v=VsPboph1BWg

hence Stars and Watercarriers
http://www.youtube.com/watch?v=CRzomXXsauw

Cav’s been on the pies: