Hotel charges can spoil the pleasure of finding a nice room rate. Many budget travelers have become adept at using the Internet to snag bargains. Unfortunately, if you let down your guard after booking the good rate, your bargain fades away. That's because hotel charges can add up to lots of extra revenue and potential budget problems for you. These days, something as simple as cracking open the cap on some bottled water can be an expensive mistake. Take a look at some hotel room no-nos.