For most people, I would say a small (3.5-5) or medium-sized (5-7") fixed blade is better than a large one (7-10") in most cases, but that's probably a matter of translation. And for most, a saw is easier, faster and safer to use, even if not as versatile.

Other than that, solid advice. I always carry twice as much water as I think I'll need between places to refill. I've groused about food weight, tent weight, sleeping bag weight and even the weight of my boots, but never water. I also always try to have sun screen with me- the first time you have to wonder if you sunburned the inside of your nose with snow glare....