You might be surprised to see food so low on the basic survival skills priorities list, though we can survive for much longer without it as compared with shelter and water. Remember "The Rule of Threes": humans can survive without food for roughly 3 weeks (though I'm sure you would not want to go that long without food!). Thankfully, most natural environments are filled with a variety of items that can meet our nutritional needs. Wild plants often provide the most readily available foods, though insects and small wild game can also support our dietary needs in a survival situation.
There are a lot of ways to measure the weight of your kit. Some people do like I’ve done here and just counted the basic gear minus food and water, because food and water are very mission-dependent. Some people count everything that goes in or on their pack at full capacity, under worst conditions. Some people go “skin-out” and weigh their clothing, EDC Kit, and everything that they’ll carry under worst conditions. There were WAY too many variables with most of these methods, so I chose to go with the simplest: dry weight (what I’m calling it), without food/water, what I’m wearing, etc.

Many people who are forced into survival situations often get into serious trouble because of direct exposure to the elements. Most people in survival situations die of hypothermia, which can be easily avoided with basic survival skills. A shelter can range from a natural shelter, such as a cave, overhanging rock outcrop, or fallen-down tree, to an intermediate form of man-made shelter such as a debris hut, tree pit shelter, or snow cave, to completely man-made structures such as a tarp, tent, or longhouse. Here are some things to think about when planning to build a shelter:
I’m using an Osprey Atmos 65 backpack in large, which gives me actually 68 Liters of space. I chose this particular bag because I already have an idea about how much space I need from using my Camelbak BFM for so many years. I originally got a 5.11 Rush 72 backpack to replace it, after MANY people suggested it and read some really great reviews on it. After thinking it all through, it wasn’t going to work. In order to carry the amount of items I wanted, I’d have to add cargo space to the bag and it already weighed quite a bit. Plus, it’s a very military-looking bag, which I’d rather avoid if I could. It also seals up at the top and has a built-in cover for the rain.