For the walls, look for trees that are seven to ten inches in diameter and cut them to fit the dimensions of your floor plan. To prepare the logs for the walls, flatten the top and bottom so that they sit flush and notch the ends to interlock them and form a sturdy corner – additionally, cutting a notch in the top log only will avoid pooling water in the joints while in wetter climates.
Many people don’t realize this, but sunlight is incredibly good for you. It helps your body produce vitamin D which kills harmful microorganisms and strengthens your immune system. Also, if you put water in a clear bottle and leave it where the sun will shine on it for a few days (a total of 48 hours of sunlight just to be safe), your water will be purified.
Gather sufficient supplies to survive for 90 days. Surviving after a major apocalyptic event is not going to be short term since the entire country or the world is likely to be falling apart––there are no two ways around that reality. However, hopefully having three months of supplies will get you settled and going with your new self-sufficient habits. The more time you have dedicated to forming a plan when disaster does strike, the better. When preparing the supplies, think in two categories: basic survival and getting by, as outlined in the following two steps.
If you’re in it for the long haul, you will need to consider substantially more factors than sheltering for the short-term. When searching for long-term shelter, look for areas in proximity to water and food sources as well as civilization (if applicable), and for an area that provides adequate visibility for you to see what’s happening around you and for others to see you. In some case, staying hidden may be more beneficial to your survival.
First you'll need to find water. Water flows downhill, encourages vegetation, and collects in natural caches, be they ponds, lakes, rivers, springs, rock depressions, or even leaves. Unfortunately, most fresh water sources are not pure enough to drink from (as they used to be), so you'll need to know how to purify water under most situations. Use any of these methods to collect clean, purified water:
Find other survivors. You've got your food, you've got your weapons, and you've staked out a place to stay. Now it's time to assemble a team a la The Walking Dead. Except that you want a team that is actually useful. When you consider taking on others (they're mouths to feed, after all), assess what they can do for you. Do they know plants? Are they a wizard with a javelin? Are they carrying their own stockpile of food?
Don't flash your gun like you do your BMW. Conceal your weapons. You know that scene in Die Hard where Bruce had those guns taped to his back (despite the fact that tape doesn't adhere easily to pools of sweat) and pulled a one-over on that German villain either played by Jeremy Irons or Alan Rickman? That's going to be you. No one's going to pull the wool over your eyes. You're a weapon yourself.