You may find a tree that has fallen and landed on the y-shaped branch of a stable tree. That would be a great blank slate for a simple A-frame shelter.
Using a fire drill is an incredible option for creating embers, although it takes a lot of time to master. Use a flat piece of wood similar to a plank and find a sturdy round stick.
A Fire plow uses a scraping motion to create friction, but the principle is the same. Using a round stick with a rounded enough edge to scrape with is essential.
Another thing to remember is to have an emergency kit at hand. What most people call a bug-out bag. This pack will contain everything you need for short-term survival in the event of an emergency.