Porridge is good for breakfast. The small packets of "golden syrup flavour" are the best, but a bit more expensive than regular porridge. (N.B. The more powdery it is the faster it cooks.)
cous cous (I like "Moroccan medley", "tomato & chilli").
[aluminium bubble foil: DIY shops sell this in the insulation dept. Use this to make a wrapper for your pan. Once that water is boiled, the rice/pasta etc put in and the brought to boiling again, the heat can be turned off and the pan put in the insulating wrapper. The stored heat will be enough to cook the rice/pasta. [For larger paster shaped eg spirals the water can be left till it's cold then re-heated] Saves weight. For long hikes I use a petrol stove because it is easier to find petrol supplies.]
For faster pasta cooking use the very thin pasta (UK vermicelli, FR cheveux d'ange)
When cooking pasta there is no need to use a lot of water. When cooked, instant soup can be added (eg "East Indian mulligatawny", "Italian minestrone"), or tinned fish (sardines), or tinned meat (bully beef).
For all these for extra flavour squirt in some olive oil (high carbs) (transfer a glass bottle's oil to a plastic bottle), especially good with cous cous. Lumps of cheese can also be added and mixed in. Some butter is also good but melts easily in warm weather. (margarine is high in water and emulsifiers, it is not high in calories).
Do not throw away any hot water. Soak it up with instant mash. (Instant mash comes in two forms: 1) flakes added to water 2) lumps where the water is added to the lumps. You need (1) as you can add as many as needed to get it solid.)
Protein: tinned sardines, bully beef, soya ("wholefood soya mince" cooks a lot faster than the lumps). All sorts of dried meats and sausages on the continent. And cheese, harder varieties keep best.
If you can get eggs along the way these can be cooked by mixing the egg into the boiling water with the pasta etc.
Dried fruits, usually raisins, for flavoursome snacks. Biscuits, eg custard creams, and chocolate are also good snacks. On shorter hikes I also take fresh fruit, apples.
After a meal I like a cup of tea. With lots of sugar. This can be made in the same pan used above without washing. The tea gathers up the bits and cleans the pan. ps If you prefer real coffee this can also be made in an ordinary pan if you don't mind a few coffee grains in the last couple of sips.