But "humans are meant to live in the wilderness" is meaning, evolutionary or otherwise. You contradict your own statement that "the universe is meaningless."
"I'm just as worthless as a grain of salt" is also meaning.
You can and do make meaning all the time. You'll do that in the wilderness just as you do in the city. Why not create some meaning for this adventure that is fun and inspiring (for yourself and for others), rather than as an escape from "normal" life?
Have you seen the movie, "My Dinner with Andre"? I think you might enjoy Andre's stories about getting away from normal life, creating meaning, and loving his life.