Not really. The scenario that you are describing entails a breakdown of the current social and political structure, which means that you prolly won't even be able to connect to the Internet anymore. Even if you could find some way to use your Bitcoins, online transactions won't really matter since looting is apparently an issue in this world order that you are planning for. What would be the point of ordering anything online with Bitcoins if the item would most likely never be delivered to your doorstep (assuming that you still have a doorstep to call your own)? Food and water are the currencies of an apocalyptic world, not Bitcoins.
Keep Bitcoins that you are not about to spend in cold storage. Forget about Bitcoins if you're planning for a T-Virus epidemic.
True, but I can always fly out to another country and hook up the internet from there. The T-Virus epidemic virus scenario is always a real possibility, then yes, Bitcoins would be useless. Good point, I haven't thought of that.
