Well, survival is mostly based on preparation. But there are some things, pretty vital to know, like where to find water (and in some cases, make it drinkable first) or how to light a fire and make a "cooking stove" in bad conditions like rain/wind (in case your are running out of spiritus).
And some basic knowledge about eatable things, wherever you go (like mushrooms, herbs and fruits).
You don't need to be a survival specialist to get around in the wild and have fun for a few days without civilization
And always (but only) pack what's most needed, you don't want to carry any unnecessary balast with you, the backpack will be heavy enough already ;)