You should have a scientific calculator. If you do not currently own one, you can get one for less than 10 bucks at Wal-mart or one of the office supply store. UBS calculator prices are dubious. This gives a total of 400 possible points. None of these increments are set in granite, and I may alter the distribution if I feel that it is necessary.
Water is okay.
If I can hear you talking from the front of the lecture room, just think how annoying you are to those around you. Please show some common courtesy to those around you. If you have to talk, whisper. Also make sure you don't have your cell-phones or pagers on.