If you want a more dedicated emergency-type food, Mainstay rations seem to be popular. I haven't tried them but plan to get some soon. 5-year shelf life, high-calorie, formulated not to require much water to digest. It is sold through many survival outlets, typical links include
http://www.bestglide.com/Mainstay_3600_Info.html
and
http://www.survivalunlimited.com/mainstay.htm
and
http://www.epcamps.com/Mainstay_Food_Ration.html

Steve
_________________________
"After I had solaced my mind with the comfortable part of my condition, I
began to look round me, to see what kind of place I was in, and what was
next to be done"