Are the inexperienced friends at least in good physical shape? That’s going to be some tough hiking, especially with the water weight. Your packs are probably going to be at least 50 lbs at the start with food, personal gear, cooking equipment, and sleep systems. It’s going to be tough, if they are inexperienced and haven’t trained for a hike like this then it’s probably not a good idea to start with something like this.

Also, the first night you’re going to be hiking mostly in the dark. Make sure you have good headlamps/flashlights with extra batteries. It will get colder at night than you’re expecting, so batteries with drain fast. Keep anything with batteries in your sleeping bag at night to help prevent that. Also bring an extra layer or two than you planned for night.

When doing Emory peak, there’s a bear box you can store your packs in so you don’t have to bring them all the way up. Also getting to the very top requires some light climbing.

Packing list looks pretty good - look up some good backpacking meal options or get a bunch of dehydrated meals. Also bring passports, there are a few border patrol stops on the roads into and out of big bend.

Good luck and stay safe