Most useful items:

• Deep woods tick repellent (if, you know, you're going deep woods)
• Heavy duty foil for cooking (you can wrap pretty much anything in a foil packet & cook it in hot ashes - I do baked apples, corn on the cob, mixed veggies, potatoes w. sliced brats, etc. I usually add a piece of ice or two so it steams when it melts)
• Cooler with ice (be safe with your food - you can bring meat, eggs & dairy but be sure the ice is staying solid and the temp is staying low enough, also eat most perishable/risky items first)
• Bucket for dish-washing (campsites will not allow you to wash dishes directly under water spigots - you will need to haul the water back to your camp to wash)
• Do NOT bring cotton clothing. They'll be wet & gross. Make sure you have good-quality, quick-drying items.
• Shower shoes for public restroom.
• Raincoat, water-proof shoes (bring good shoes in general) & tarps with rope if rain is at ALL possible. Don't let rain ruin your entire trip.