I am very similiar in that I can't go without lunch (or breakfast). If I do I always get very sick and dizzy. Supper, I can do without. I usually take 2 sandwiches, a few of those Peanut butter cups and a bottle of water. Never anything other than water. I also like to take a banana with me too. I won't rule out an apple in place of the banana when its warmer, but when it turns of cold, no way will I take an apple. I think the banana helps my sensesstay sharper. All of it is put into a small ziplock bag.