The one thing everyone seems to forget when they go camping is moist wipes. Seriously. Swamp ass is miserable. That and bug spray are the first things I pack before everything else. Clean socks, clean underwear, clean nuts, butts, and pits. The necessities of life.
This is always part of my list.
I always pack some helpful over the counter meds too; Benadryl, Pink Bismuth, and Tylenol cover most discomforting aliments people run into.
If you're doing a lot of walking a good blister kit is needed. I put trail toes as part of mine. Works good on your torso where pack straps can rub too. Leukotape is super helpful too, I wrap some around a cigarette lighter.