And that, my friend, is the whole point of the exercise. We all talk this game but we don't really know what it's like until we have to do it with almost no gear and no comforts. It's actually damn fun, as much as it is hard. Done this a few times with no gear. You get hungry the first day and after that it pretty much goes away.
As a side note, depending on where you are I would suggest a small bottle of bug juice being one of the top things in the altoids tin. After doing these very deals several times, the mosquitoes can be the most challenging thing you face.
Very good advice.