Flip-flops become as important as soap, shampoo, etc. You will never find so many excuses for a bucket. Make sure your alarm clock has back-up batteries. Duct tape heals all wounds. Showers become less important.
Sleep becomes more important.
Two meals a day are standard. If the lecture hall is big enough, get someone else's notes. Your bill in the bookstore will almost equal tuition. Labs used to be fun. T.A. used to stand for teaching assistant, now, for terribly articulated.