Food ideas for festivals when on a budget

[pollycazalet]

Any ideas for meal ideas? I want to have food for lunches, breakfasts and snacks - happy to pay for evening meal food. Am all out of inspiration for the lunch part.

we take rice cakes, chocolate spread, peanut butter, carrots, apples, crisps, olives, cereal bars.
We're in a caravan now so can expand a bit, but when we camped they were our staples and we'd take enough bread rolls and Philapdelphia cheese to do the first two days lunch as we found it kept well enough in a cool box.
Usually take soup/pasta/noodles to heat up on cooking stove. Standard cereal for breakfast with enough milk for the first day as you can always buy milk somewhere on site at a festival.