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.
Lets back up a minute. Pretend you just got home again, but this time you surveyed the situation and decided that you are not in immediate danger but are still not at situation normal. Now what do you do? A Bug In Plan is for emergency situations where you can stay in your own home but have to rely on your own preparations to survive. This might just mean that you will be without power or water for an extended period. Maybe it means you actually can’t leave your home at all for whatever reason.
Don't worry about those questions. Instead take action and educate yourself on survival techniques. Nature is unforgiving and you must be prepared to fight to stay alive. The contents of this website are taken from actual US Army training manuals, this is the same material used to train the best army in the world. You will not find a more complete resource on Wilderness Survival. So prepare yourself because one day you may need it.
When searching for immediate, short-term shelter, look for trees (especially fallen trees), rocky overhangs, and caves. Trees are an obvious source of shelter and have many useful parts for building shelter including the trunk – which can be used as a support, the branches – which can be used as framework, and foliage – which can be used as insulating material.