I may or may not be of much help here. Most my multi-day excursions have me above the treeline where I'll push to reach one or more summits. A typical multi-day for me would be, say, 30 to 50 km with 15k to 20k vertical feet of elevation change involving 3 or 4 summits, and over 2 to 3 days.
I would suggest reconsidering the perspective from this thread’s original post on trail mix. I pack organic walnuts, pumpkin seeds, cashews and (iodized) salt. Maybe some raisins and almond bark (milk chocolate with almonds) for flavor. That's it! A few years ago, I found out the hard way about electrolyte imbalance: I lose a lot of salt through perspiration - especially during the summer months - and would experience abnormal cramping at rest. I'm not just talking about sore legs and forearms from scrambling and climbing: I'd get strange cramping all over the place when I was setting up camp, or at rest, or dozing. Or I’d wake up with the arches of my feet cramping. That kind of thing. It was more annoying than unbearable, manageable with a little on-demand stretching. I chalked it up to fatigue, until I started drinking Gatorade. Then the cramping went away. Gone. Entirely. Yet there’s all the refined sugar, the “brominated vegitable oil” and “yellow 5” etc. etc. Gatorade now has products that are marketed as being more “natural” – and maybe they are – but I find myself increasingly cynical as I grow older.
So I did a little digging.
The walnuts and pumpkin seeds are much more energy-dense by weight than even pure table sugar (walnuts alone have over 1.5x the calories by weight than pure table sugar!). The nuts and the iodized salt deal with any electrolyte imbalance. Or at least they certainly have for me. So it should go without saying that if you're concerned about lowering the sodium content in the food you pack then this post is not going to be of any value to you whatsoever.
So I say yay for trail mix. For the last two years or so the only reason I use my stove is to boil water for tea, or to heat snow for water during the winter months or when I’m up over 3500m (or way over 3500m). I’m aware of the concerns about waterborne illness and if I hiked more conventional, below-the-treeline territory I would almost certainly boil more of my water. But I’m not, so I don’t. And I’ve never had a problem with any kind of waterborne illness.
I hope this post is helpful.