Yup, its all just PV=NRT….keep the canister warm and just about any self contained canister stove will do (jetfoil, reactor, etc.). I swear by the bowl of warm water trick that Colin talked about, like he said keep it topped off with warm water so it does not freeze to the canister, at the very least ket a hang kit or foam pad to insulate the canister. The only time I’ve run into a problem was at a balls cold bivy in Alaska when our bowl froze to the bottom of the stove, had to smash it with an ice tool to use the stove. We could barely get the reactor to crank out 3 L by the time we went to bed even though we were warming and swapping out the canisters. Moral of the story; have a backup plan because even water losses of 2% begin to affect performance, and just a 5% loss in water will decrease your capacity by 30%.
As far as food on route goes I swear by carbohydrate replacement gels and shakes when my heart rate may/is elevated and the workload is moderate to hard( favorites are Hammer gel and perpetuem) anything else, for me, won’t digest fast enough due to the decreased percentage of blood flow to the stomach during exercise. But I have found that really long days involving a ton of running on an all gel diet will cause stomach and bowel issues. Not fun.
Any “regular” solid food is restricted to long belays, brew stops, and bivis, but even then my rule of thumb is to keep it simple so that its easier to pallet (almond butter packets and salami). For hot meals I’ve found the best bang for your buck are the instant mashed potato packets mixed with olive oil, tuna, and some sort of seasoning. Depleted glycogen stores love the starch and the high fat content will keep you warm through the night. Oatmeal with some almond butter and coffee in the morning.
Ive heard about more ultra runners fueling with more fat centered food while racing/training and trying to avoid carbs. It would be cool to hear what Scott has to think about this issue from a physiology perspective, specifically if it could at all carry over to alpinism.