Yeh, go for it officerfriendly, just without a whacking great knife – as others have said something like an Opinel (and a sharpener) will be fine.
Fortunately I’m old enough to have grown up in an age when you could get away with just about anything outdoors, as long as you didn’t do any actual damage (or get caught).
Keeping warm and dry might be your main problem – the old adage is that the limits of survival are 3 minutes without air, 3 hours without warmth, 3 days without water and 3 weeks without food. Bivi bags aren’t fashionable these days (fancy group shelters being the in thing) but might be worth having.
You could also look at getting involved in something more organised (again, not so fashionable these days) – Duke of Edinburgh, Scouts, Cadets etc.
Best of luck anyway, better than sitting on your arse with an xbox!