The TSA travel rules are still enforced, but the 3.5 ounce liquid rule seems to be given a little wiggle room. If you are traveling with a slightly larger bottle, that isn't full, you may have a better chance of getting it past the screeners. For those who want to carry water, but don't want to pay airport prices? The work around is to bring an empty bottle and fill it at the drinking fountain once you get past security.