[ninty]

going to walmart or similar stores is a bad idea because that's where everyone else is going.

i see one of two options. you either bug in. you would need supplies and the ability to fortify your position. which might be hard on the 5th floor, or you get out of town to a predetermined bug out location stocked with supplies.

just consult these guys. they'll help you.

http://zombiehunters.org/forum/

[KTOG]

http://www.randomhouse.com/crown/zombiesurvivalguide/

Buy this, you will not be disappointed.