I needed a semi-permanent shelter out on the land as James and I went about clearing the trash from the land. I did not want to spend any money. Additionally, I did not want to take a lot of time messing around as time on the property is limited. Since Tarps are cheap and plentiful we decided on a tarp setup.
All we did was string a taut center-line between two trees,. Next, we spread the tarp over the line. Then we created cord tie-outs from the corners out to other trees to finish the tarp setup.
I set up the tarp so that the 4 corners are pretty high when it is in use. However, when I leave to go back to work, I can take two corners and drop them much lower so that rain does not collect.
This setup works pretty well, and we have had a couple of good thunderstorms over the past month and I am very pleased.
In conclusion, I would say a trap and a length of rope are bush craft essentials and you can build a shelter anywhere. A tarp setup is extremely adjustable you can adjust to almost any situation. One tree, two trees, no trees, it can all work with a little thought and some rope.