Just think like MacGyver. As doofy as it sounds, I'm actually being serious. You've got an environment of things around you that are perfect for all sorts of things. You're going camping, so you're going to probably be in a wooded area. What are all the kinds of things you'd expect to find in a wooded area? You've got leaves, wood, sticks, mud, rocks, and all sorts of other things. And that's just for example, but just think about the kinds of things that you will have readily at your access. Just think to yourself. What would MacGyver do?