Yes. You want to make bread? Yeast can be found on blueberries and the berries of cedar trees. It's the whitish coating on them. Fox fire may have some gems in them but they have equal amounts of useless and false information. There are better books that don't waste so much of your time. Basic survival is about fire and water. Keep your insides wet and your outsides dry. You have a fire within you that must be fed. Making fire is like feeding a baby, start with very fine tinder and not blowing too hard on it gradually increasing size and intensity as the flames grow. Water can be found in most lowlands simply by digging in low areas where water-loving plants grow (ferns, jack in the pulpit, nettles etc).