Let's say you found yourself on a remote piece of land, similar weather to that of Cyprus or Southern Greece during the mid Spring season. You can travel any which way, the further North the colder, more mountainous it becomes. The further South you approach the ocean and the warm, rocky coastlines.

If you were dropped in the dead center of this land with nothing but the clothes on your back and a makeshift flinthead spear, could you survive for 100 days with JUST that. No bags, no water containers, no ready-to-eats, no compass, lights, replacement socks, gloves, pocket knives, or ferro rods. Nothing but your spear and your clothes.

Challenge mode: No tools other than the spear, that means NO FIRE.

Could you do it? Could anyone adapted to 21st modernity do it?