Loaded question. To only have your mind and multitool means either your wholly unprepared, had epic fails to get there or relying on others for survival.

That being said, its situationally dependent on location, injury and assets available. Even the sharpest mind and multitool would be hard pressed to make it in a frozen environment if you have limited mobility. Or the desert.


Given a 100% body and ability to modify terrain assets, (growth, deadfall, hydration)its very feasible to make due with just those two items.