I like rice crackers (or Wasa whole-rye crispbread) & hummus & Clif energy bars. All depends on weather, availability of good grocery stores etc. Quick-cooking oats might be good, I've eaten those uncooked (just soaked in water) & still OK. Read a book about sprouting that suggested making sprouted beans, alfalfa etc while traveling though I only did sprouting at home. Dried beans, alfalfa seeds etc are very light & the sprouts are nutritious & tasty. Athletic instant-drink powder can help supply a nice amount of calories with minimal weight.