The way that I would survive one is to get a group of brave and helpful people to all hide away and gather weapons, a whole lot of ammo and some grenade. Also other things like medic packs. Wait until you hear someone that tells you to go to a place to be rescued. As soon as you hear that, make your move. Head there straight away and mow down any zombie that is in your way but try to save your ammo. Try not to shoot anything that will make a loud noise as the zombies are EVERYWHERE and they are attracted to loud noises and will appear in large numbers. When you get to your destination you must notify the people that will be coming to rescue you. Once you see them in sight. Light up a flare and throw it to where you want them to pick you up from. After they are almost at the flare you must run like hell until you get to the vehicle. The doors/hangar/ anything the vehicle might have will close and until that point. You are still not safe. Once they do close, you are safe