This depends on what kind of schedule your theater program works with, but...
A short list of the nearest, best and/or cheapest restaurants and convenience stores, with phone numbers and delivery info if it's relevant. I remember a lot of Quiznos and Domino's Pizza in high school - the drama office had a Rolodex with local restaurant delivery phone numbers, and those were the two places open after 10p on Mondays. The convenience stores were a huge help when we ran out of anything - basic makeup or hair supplies, first aid, snacks, even small hand props could all be found at the local 7-Eleven.
Use your discretion - this may be more of a distraction than a help, if it goes out to all crew members - but it can't hurt to have it in your back pocket!
Meg