Flipflops 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. It takes more than one person to carry your laundry, books, trash, or alcohol. 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.