I recommend not bringing too many useless things (such as your whole makeup collection etc) as I tend to make this mistake way too many times.
The essentials would be a tent, sleeping bag,blankets, blow up mattress(if needed), clothes and toilet roll. It might be a good idea to bring extra socks too if you're likely to get wet and muddy.
Other things you could bring is phone/camera/ipod, portable charger (this is VERY important) ,hairbrush , minimal makeup (if you'd like),mini speakers could be a good idea if you get bored.
As for food having one of them mini portable bbq are always great when camping.
Hope this helped, have a good trip (⊙ヮ⊙)