Good reading material -- can get a little boring and tedious even with folks you like after even 24 hours in a very small shelter.

"War and Peace" for starters, as it will get you thru 2 weeks of evening reading and provide some great philosophical perspectives/dialogues with your sheltermates after calamity strikes (war, like hurricanes and tornados, alters the landscape one lives in).

"Seven Pillars of Wisdom" by T.E. Lawrence (a compelling read, will provide inspiration for handling adversity when the odds are stacked against you)