[nwhybrid]

The TSA would have a field day with all your cavities if you try to even so much as bring more than an ounce over three through airport security. Good old USA!

[jrockway]

You bring an empty water bottle and fill it up at the airport. I've never seen an airport that charges for tap water.

[icebraining]

Yeah, either fill it up or buy in the shops after security, which (in my experience) is still cheaper than in the plane.