[ScylaX]

That depends from how is the environment that surrounds you, did the apocalypse only destroyed humans and everything that have been human related, leaving the area clean and safe ? Or did it also destroyed everything that allowed you to live ?
Looking at the different posts I'll consider the first conclusion.

Your genetics will eventually help you to develop survival reflexes and allow you to live a longer time. I guess you will not be alone, like, 10 people for the whole town so, as the time goes, you could basically reconstruct your life from your personnal knowledge. Of course, knowing about the reflexes to have when you're in a survival situation is an enormous plus, because it will shorten the time you'll take to get the reflexes and, thus, reduce the chance for you to die from accident or distraction.

In an utopic way to see things, it's what that would happen.
However, I think most of us wouldn't even survive in an environment that is as cruel as that. If you're physically weak or handicaped for any reason, you will have no chance to survive. Because you have never been used to these circumstances and your physical health will prevent you to do so. From the first day, you will probably not eat if all you have are your hands and a natural environment around you :

How will you learn about hunting a prey ? Knowing which plants are poisonous and which aren't ? Considering the right factors to deduce something correct ? Etc ?
All of this depend from experience and personnal knowledge you randomly acquired by reading books or whatever on the matter. It will take a long time before you will get used to that way of life and most of us would probably die if we survived to the apocalypse.

Also, think about the diseases that will pop out more freely because of the absence of any medication, your metabolism became accustomed to that kind of things, y'know, that clean environment you live in everyday, these pills you take when you're ill, these sterile bandages you put on a flesh-wound. You will be way more sensitive to harmful bacterias, viruses, and even simple infections or wounds since you will only have medical plants or survival-reflexe to - temporarily - treat you.

PS : Considering every humain installations survived would led us to an "artificial death", since many, many entities would be still "running" with no maintenance or whatever (like : NPPs, sewer network...etc I'm kinda tired so I can't think about more examples). It's why I talk like everything have been destroyed with only nature living through.

tl;dr If the world ends, except if you have a good fitness and trained for that kind of situation, you're ****ing done.