If you can get from your class to your dorm without too long of a detour, even in the event of a derailment, then egress from the scene is possibly the biggest issue. I know you mentioned there not being much liquid, but on tank of something bad is enough to be a big problem. In addition, plenty of solids can burn and put out some nasty gases. Something like this may be a good idea: http://www.botachtactical.com/tebrofli.html.

When assessing survival, think about how long you can live without something, and consider the rules of three. You can live for: three minutes without air; three hours without shelter (depending on your environment, in a blizzard for example you may not have much time), include clothes in shelter; three days without water; and three weeks without food. Also, if you can, have three soures for everything you will count on. One can be the normal source, one can be something you create from the environment, one should have some preparation. So, water that comes from the tap is one source, a bottle in your closet in another, a third may be a method of treating water. the right ones for you are the ones that can work in your area.