Since you have yet to fill in any information about your location etc. I am going to have to keep answers very general in nature. www.thecompassstore.com has some information on how compasses work and how to use them to give you a general idea. One book that will explain it in depth is Map & Compass by Bjorn Kjellstrom.
The classic use of a tube to get water is probably from a solar still where you can suck the water out of the catch container with out disturbing the still. Some water seeps in the woods are very small and would also have to be taken with a sponge or tubing or something. I’m sure that there are many other uses this is just the first one to come to mind.
www.thecompassstore.com