Thanks for all the good ideas - toiletries!! The extra clothes, blanket, food and water stash could go in a bag under my desk, and there will always be the car kit, if I can get to it.
I work in a hospital - but I am in a cube-like space away from the direct client-care areas. In an emergency, it would be likely that staff living in outlying areas could not get there - and there will always be the ones that "freak" and leave. It would be a case of "all hands on deck" and I would be put to work doing anything from kitchen duty (yes, there is a cafeteria) to housekeeping, to whatever needed doing.
We have participated in city-wide disaster drills. Although my facility is not acute care, it is closest to the airport and has been designated the first-response triage location. The emergency plans I am familiar with have - understandably - more to do with caring for clients than staff.
Thanks again, and if in an emergency I find myself sacked out on the floor for a quick nap, or wanting to brush my teeth after too many hours...I'll be glad you all made the suggestions you did.