My favorite pens to use when rewriting notes! Their tips are small enough to write all the information I need and don't bleed through paper. Although they can see been through thinner paper, they still get the job done. They're also small enough to put in your pocket if you're too lazy to carry a bag.
A reusable water goes a long way in making sure you're hydrated during class. Not only can you use this is regular old water, you can put hot water in it and make tea, coffee, and whatever you like. Use this bad boy so you don't have to pay that extra $1.50 at the cafeteria.