What are you prepping for? What are you prepping against?
Everyone wants to talk about guns and ammo, but the reality is that you should probably be looking at provisioning yourself to be able to stay home for 60 days without going outside. Lots of problems can be solved by locking the doors and leaving the blinds closed.
Regardless of your religious affiliation, the LDS church has good resources on food storage, including how to integrate it into limited space (apartment living), calculating requirements and even storage resource centers where bulk items can be purchased or packaged - even by non-members. Search 'LDS food storage' and do some reading.