Originally Posted by
lexande
Do you have a source for this? Many times when I have passed through security in the US, UK and elsewhere, the security personnel specifically asked people to finish the contents of their water bottles etc so that the empty bottles could be brought through. The rules at
http://www.tsa.gov/311/index.shtm are not clear either way, but I would be surprised if TSA employees were giving specific instructions to break the rules.
Look
here for the UK rules, as applied at BAA airports. Note, in particular the requirement that "the size of container must not exceed 100ml, regardless of the amount contained inside" (on p.1 under the 'food' heading).