Killing the dead all over again, day in, day out. It ain't pretty and I sure as hell don't smell to great once the day is done, but hell, there has to be other survivors out there. There has to be. And somebody has to put these corpses back in the ground so we all got a shot of finding each other.
Needs? I need to stay alive. I'm doing okay on my own, but I want people watching my back. We wont survive alone. There are billions of them, and not even a tenth that many of us. We aren't hiding out and trying to outlast a storm here... we're fighting to survive. And we need each other.