Next time you have to travel somewhere, think ahead and bring the stuff you otherwise up shelling out for. When you do need to spend, spend wisely.
– Bring your own decent headphones for the plane and for use with an MP3 player anywhere else you want some of your own music to give you aural privacy.
– Acknowledge in advance that most of the time now airlines will not provide anything worth eating and that the airport food choices will be fair to middling at high to higher prices. Pack a lunch or at least bring some good snacks from home.
– Tuck one or two of those magazines you've been meaning to get around to reading in your bag or print out a long article from the web. Something off the stack at home and no "it'll do" choice at the newstand in the airport.
– Staying in a hotel for business? Don't drink the stupid tiny $5 water bottle in the room, take a walk over to the nearest grocery or drug store and buy a big bottle for half that price. Your legs could use the stretch and you'll see a little of the outside world.
Got some more tips for penny-pinching travelers? Comment away!