Follow this link to the ideal solution to handwashing outdoors, particularly in woodland sites. The Tippy Tap site gives information on the background and the instructions for building your own Tippy Tap. All you need is a big plastic bottle with a handle, a nail and hammer to make some holes near the spout, some string or rope and a structure to hang your bottle from….easy!
http://www.tippytap.org/the-tippy-tap