Another good idea along the "emergency food" line... I carry the main entree from a military ration MRE ("Meal Ready to Eat"; "Meal Rejected by the Enemy"; "Meal, Repulsive, Extremely") along with a flameless heater. Like EmmCeeBee, this lives in the bottom of my pannier and is only for those times when I'm out of food, ideas and hope.

Pita bread also works great for sandwiches since it's already mashed flat.

Sam