im with ross on that one i tend to drink around 3 litres of water over the course of a day so i dont have the need to drink masses when im training i also just sip some water thats not too cold as well, i found that sometimes if i was too cold then i would also get a cramp if i was trying to lift hard. i will sometimes sip on something that has some glucose and salts in it to replace what im sweating out though.