Found the graze boxes really good, looks of dried fruit, nuts and seeds and some variety. Not sure if you're in the UK though!
I took some dark chocolate, some cheesy biscuits and lots of fresh fruit and berries which I kept in a cool bag in the car. I was STARVING after I had her and a grated cheese salad was never going to cut it! OH ended up going to get me me noodles in the end!x