What kind of food or snacks should I bring to school?

I go to a school that is in the middle of no where, so there is no stores around (its twenty minutes away from my house) and they dont sell food there. It is mostly online, but when I do have to go usually it is for the whole day (from 8AM-4PM). So what kind of food or snacks should I bring? Stuff that doesnt need refrigeration or to be warmed up. Im kind of picky and honestly I cannot think of anything. Usually I just eat in the morning and as soon as I get home, but im always soo hungry when I am there. So any ideas?