Harvest wild edibles and use them as tea and medicine.

This stuff grows like crazy all through the Boreal Forest.  Yarrow can be made into a tasty tea and is also used as an anti-septic.  If you get a cut or scrape while on a hike, chew on a few of its leaves for a couple minutes, and then run the leaf he affected area.  A lot of native herbs (regardless of where you live) have such properties.

Look 'em up and check 'em out.