Riders on the Apocalypse

Isolated, scared, and confused. Remi, Nikki, and Jimmy seem to be the last of society. They were just having a regular dinner with their friend, Dawson, days ago. However, he had turned before they can reach him after the apocalypse broadcast. They now remain stranded on the rooftop of their complex, which has no food or water. Should they stay and wait to be rescued, or save themselves?