This is a great mod for Arma 2: CO. You have to find food and water as well as scrounge around for weapons, ammo, and car parts to repair vehicles. All while looking out for other zombies and other survivors trying to kill you and take your beans.
I logged in once and didnt have any food and almost died trying to find some. My screen started to fade in and out and everything turned white. It was HORRIFYING! I couldn't even see the zombies.
Dayz Mod Homepage