just think about covering your basics first, once you have all the basics covered just keep covering them in different ways.
Fire: (Matches, Fresnel Lens, lighter, firesteel, tinder, knife, saw, axe. etc)
Water: (water purification tablets, steel water bottle-for boiling, water purifier/filter, ziplock bag, bandana, etc)
Food: (food bars, wire/trapping knowledge, fishing kit, sling shot, edible plants knowledge/book, freeze dried food, knife- spear making, trap making etc)
Shelter: (Knife, Saw, 550 Cord, space blanket, sewing kit, tent, tarp, wool blanket, duct tape, poncho, etc)
First Aid: (bandana, gauze, bandages, antiseptic, duct tape, super glue, tweezers)
notice several items can help you in multiple categories such as a knife, bandana or gallon ziplock bags, knowledge and practice doesn't weigh anything, can be free, and is something that if you don't have none of the other items will help you with. For example if all you had was a knife on you, but a lot of skill and practice you could cover just about everything else (fire with a bow drill, water collection from plants, or carving a cup to boil water in, building a shelter, making a spear for food/protection, of course with the right materials and knowledge you can do all that with knapped knife as well.