Shelter along with water and food is a survival essential. Your bug-out-bag must have the means to construct a shelter or you can carry a shelter such as small nylon tent, ponchos and waterproof tarps. Tents can be awkward and are not suited for quick shelters against a sudden rain shower or simply a way to get out of the sun. However, tents are ideal for extended stays once you have reached a suitable spot to establish a base camp. Tents are not ideal if there is the possibility of intruders because you cannot escape one quickly and your field of view is severely limited inside of a tent.
These shelters can be erected virtually anywhere. Consider your visibility and any likely visitors, before deciding on a shelter location. Only erect a shelter if you feel confident there will not be any foot or vehicle traffic. Otherwise, you can utilize other structures. Avoid drainage ditches or culverts for fear of flash floods. Others can also trap you in culverts or tunnels.
Approach and use abandoned buildings with caution. Others in your situation will have the same ideas. Keep in mind at this point anyone you meet can be an aggressor or a competitor for resources. Always use the ground floor of any building and ensure there are multiple exits. Never build a fire inside of any building for safety reasons and shield your fires outside.
Avoid so-called camps of refuges. Although the majority is likely in a position such as yours there will be camp followers that are thieves or worse. You must practice self-reliance at all times. City parks will likely be full of people with nowhere else to go, many will be there looking for answers or hoping for assistance. Look for carports or abandoned garages, for a quick rest before moving on. The overhead cover protects you from rain or sun.
Pick a spot where you have a wide view of any roads, paths or highways. Make sure if you see someone coming in one direction you have a means to go in the other direction. In other words, do not box yourself in, where there is only one way in or out. Always look for any green spaces when hunting a shelter location. Once you find one look for seclusion and screening from others. If you find a spot that has not be trampled or used by others, you can erect your shelter and build a small fire, if you are hidden from view. If it is obvious, others have used the spot move on, they will have left garbage and feces that can harbor bacteria and diseases and the spot may be known by others.
Avoidance is essential at this point in the crisis. You will want information and association with others. However, keep in mind unless you speak to the authorities anything others tell you will not be facts. The situation is only likely to have worsened and it is important you keep moving away from the crisis center.