Ill take a saw... A first aid kit and some water is not going to make me feel safe... Though something like this is possible, it is not very likely at all. Not that it is possible as in the games though, that's a bit far fetched. But then again, maybe that is even possible?
I'd probably trust my handy katana in this situation. Not sure if I'll be able to fire in close-range, but I'd definitely be able to lop their head off!
This is a joke right? They believe there's going to be zombies? Wow. If there ever were zombies, I'd lock the doors, make a secret underground basement, forage supplies and stay there for years.