As a basic principle, we carry a complete change of clothing so we can sit out the afternoon and evening at overnight camp comfortably. We have a half piece of carry-mat for the upper body and a small sheet of bubble wrap for the legs. We find our old KIMM sleeping bags cold, so try to keep our first day fleece dry so we can wear 2 to sleep in. We spend hours in the supermarket trying to find the foods with loads of energy in, unlike all the others who are trying to do the exact opposite. We use these for mountaineering too, because it seems crazy carrying around heavy food.
Noodles provide the carbo element.
A carbo and isotonic powder mix kept in small sachets, then added to the bottle when we refill, really helps keep us energised. We also take energy sports bars for food during the event. We make a quick noodle meal when we get to overnight camp in the afternoon - this helps keep us warm and aids recovery. Day 1 Getting to KIMM venues is generally a nightmare for us. That M6 is horrendous these days.