Drink lots of water! - Airplane tip {Gadling}

Jun 3rd 2010 7:10AM Even better, avoid the expense of over-priced airport bottled water (and breaking bills, ending up with useless change), and use the empty bottle trick. That's right, carrying liquids through security is a huge pain now, but carrying an empty bottle is totally fine. Then, just fill it up at a fountain before you board the plane. If you have to throw out the bottle, no loss really.