The best idea I can think is to set up the tripod mark the leg points with a spot of paint or similar. Then line up the shot and mark the pan and tilt points on the tripod head so you can line them up every day. If you are using a zoom lens make a not of the zoom position.
This may not be perfect but you could fine tune the position in post using a building. I think that will be as good as using bits of wood etc. Another thought is to some how attach a laser pen to the camera and line it up on a particular spot and adjust the image in post.
These are not perfect solutions but I don't know of a way to do this perfectly without keeping the camera in position.