Dang! The italics didn't come up, did they? Never mind, it was the bits in brackets, should be obvious enough.
The powdered energy drink is Boots Isotronic, tastes quite nice as well as allegedly helping your hydration. They used to sell it in individual sachets, now you can only buy a tub of it. I spoon as much as I want into a little plastic bag [little freezer bags are ideal], so it's not much to carry, and what I leave at home in the tub keeps for the next trip. Boots also do a nice range of energy bars and the like.
Every supermarket sells powdered milk, which isn't milk really, it's a load of chemicals, but it looks and tastes about the same. Again, I measure out what I will need and put it in a little bag.
Not everyone gets on with muesli. The trick is to mix it up in the milk and et it soak for as long as possible before you eat it.
The freeze dried dinners are Reiter. They're not that wonderful [I still mourn the passing of Raven Outdoor Cuisine - anyone remember them?], but I still find a hot pack of Reiter satisfying in the evening after a day's walking. There are other ones branded Wayfarer, but they're much bigger meals [made for big Americans], dearer and heavier. I don't like messing about boiling things, either, uses more gas for a start. Just to pour on a bit of boiling water is all I want to do.