>"You actually don't even need the cork"
You actually don't need the cork, needle, Chapstick, or water.
Point the hour hand of your watch (real watches have one) at the sun. Use a twig to cast a shadow across the hand if you need to (works in the fog). South is halfway between the hour hand and twelve o'clock in the northern hemisphere. North is... well you'll figure it out from here. ;)
If you have a digital watch you know what time it is, so this still works. Just use a sketch of a watch face scratched on a piece of bark or whatever.
Sorry 'bout the hijack... just caught my eye, and I had to.