I’ve used “Expedition Foods” dehydrated meals before now, but they’re quite expensive (about £6 each). Probably best calorie to weight ratio going though. Chicken Tikka or Korma is recommended, as is porridge and custard and berries. Didn’t rate the Rice Pudding though.
Other easy stuff – Blue Dragon noodles are often nicer than Batchelors Supernoodles.
Smash – cheap, easy, lots of calories, bit bland unless you add something else.
Fine egg noodles – again, easy to cook as only require dumping in boiled water for a few mins, so efficient on fuel, but need something else to add flavour.
Last weekend’s egg noodle/ Ainsley Harriot’s Mullagatawny soup was fantastic. Because I was only going out for one night and most of the rest of my kit was light, I did treat myself to Sharwoods Saag Aloo, which was pre-cooked and only required warming – also nice.
Other stuff I take includes nuts (hazel or walnuts have the best calorie content), raisins, jelly babies, chocolate coated coffee beans, normal dark chocolate, malt loaf, cereal bars and so on.