What are some healthy, simple foods?

By simple, I mean generally no-cook foods such as fruit kebabs that can be made with things in the average person's refrigerator or cupboards. As a 13-year-old (which I would not like your opinion on how young I am, but thanks for the concern) for the moment, I am on a low budget of $20 per week. If I need to buy something like celery or organic peanut butter, I can. I cannot, however, exceed 1,300 calories per day. Thanks!