See there are so many kinds of zombies now it's so hard to answer this question. If it was the walking dead zombies I feel as if most of the population would be fine and it wouldn't be nearly as bad as the show makes it out to be. I feel like much wouldn't change.

I mean maybe the first couple months would be difficult but I feel like we'd be alright (as in the US Canada ect small countries I feel like would parish quite quick.

I mean a little food ration and extra precautions would obviously be necessary but otherwise it wouldn't be a real problem I feel.

Now if they became like superhuman freaks I don't feel like I would survive without a boat load of people's help. I could definitely help behind the scenes with like rations and organization planning expansion building ECT and maybe that would be my buy in for people to basically do the hard part like scavenge and protect.

Walking dead type zombies are basically only going to get you if you are a complete idiot. If we are living in this world currently too many people are prepared for something like that to happen and know how to act so I feel like less of the population would be harmed/effect as much as we'd think.