Bullets are one of the main types of ammunition in I AM Alive, along with arrows and shotgun shells. Bullets should be saved as they will be needed to defeat enemies in some of the later Chapters. These bullets are required for the Pistol which at the start of the game has no ammo in it.It is very likely you will never see a full magazine of bullets as they scarce due to The Event. Since they are scarce it is advised that the only enemies you should definitely kill are the ones armed with firearms who will shoot on site.