In this day and age if you aren't screaming bloody murder by the time you arrive at your gate (or for that matter your destination) you are doing pretty well. McCarran is pretty new (at least the section I was in where you have to take the monorail to get there) They do have the body scanners and I was prepared to get all dramatic and opt out (I don't believe they are safe but the alternative isn't too appetizing) However I did not have to worry about it I just went through the line.
The water is too expensive-people we are in the middle of the desert and I am about to get on a plane I need my water!
You can lose whatever money you have left on the slot machines while you wait at your gate.