Good ideas for survival kits in this article.
What's in your 10 Essentials kit? Mine, which like all our scouts I throw in my backpack or daypack for every campout, includes: headlamp (plus maybe an extra somewhere else in my pack), knife, water purification tablets, matches, lint for tinder, a disposable lighter, flint and steel, duck tape, and an extra compass. The extras are because every now and then a scout will forget one of those things. I also bring a small first aid kit, and a small notebook and pen. The rest of the 10 are somewhere else in the pack: extra clothes, extra food and water, sunscreen and lip balm, a map or two (extras, you know), whistle, etc.
The best list is of course in your Scout Handbook, p. 264. Plus what to have in your first aid kit (p. 127), what to wear on a campout (p. 272), and what to bring camping (p. 292).