You mentioned earlier that you brought a great deal of water before, so my question is why did you even bother to ask if you've carried water in your luggage before? Seems like a long thread to discuss something that has been done (not quite as much, but still more than most would bother with). To me personally, it seems like waste of time, space and potentially money if you aren't accurate in your luggage weight. Water just isn't a
budget breaker. You'd be better of bringing a pitcher w/filter and a few bottles to refill.