Pommette
Trying - very!
Also (apparently) the colder the better. Ice cold water apparently has minus calories as it takes your body energy to warm it to body temperature. So, according to my dads PT, the colder the better.
Just a word of warning - take care if drinking ice-cold water after exercise (when your body is hot) as this can upset your tum. You might also find the same if drinking ice cold water in a hot climate.
Also don't drink ice-cold water after a hot meal - it just "sets" all the fat in your stomach and makes it harder to digest. You are far better off having something like green or herbal tea to aid digestion!