In the second half they give you a shitload of ammo. I swear that I could kill each enemy in the game twice with the ammo they gave me. I didn't even use the AK or the uzis and I had like 200 handgun bullets, 20 grenades of each kind, 30 shotgun bullets, 4 first aid sprays, 20 bowgun arrows and a lot of other stuff on my first playthrough. I did dodge a lot of zombies and used the knife a lot though. In zero, I was always on low health and when I finally found a herb or spray, I had to use it immediately.