All of the ingredients may be found at your local dollar store! Woo Hoo!
Personally, I like to make sure that I always have canned tuna and canned chicken breast. If you get bored of the tuna, change gears and use chicken.
As for bread, I would leave the crust on! Then, use whatever type of bread that you have! Personally, I like a good loaf of Italian, but if not in my pantry, I like white.