Just a note to all who feel that it's inappropriate to mention this on a public forum, it's public domain knowledge, usually known to all 12 to 14 year olds who pay attention in their science class.
There are quite a few other options as well. However, seeing as most of us still have all our fingers, one assumes that with knowledge came wisdom not to try it.
However, the liquids restriction is a farce and isn't that hard to circumvent if you apply some grey matter to the problem. As such, it's not really the appropriate security check to deal with the problem, which means that at some point it will be circumvented because the security people won't be looking for the real problem.
At least now that I know that they don't seem to worry about an empty bottle, I can avoid enriching the profiteers selling water at inflated prices airside by taking through an empty bottle and filling it at a water fountain.