I couldn't agree more with the poster who mentioned that 0.5L isn't enough for most people to be carrying at a given time at Philmont. I think 2L is probably appropriate. It's still extremely valuable to gauge the itinerary for the day, because it is quite likely that one can get by with less than capacity water for trips between camps. But hydration is still the most important part of beginning your trek, so if you're going to cut weight, don't do it at the expense of water.
Everything in the article looks great. A recommendation that I do have is that the more shakedowns a crew does prior to going to Philmont, the more successful they usually are. Use the shakedowns to help scouts and adults whittle down the unnecessary items in their pack. There are lots of easy ways to do this, without even buying more gear. Plan ahead and prepare. Shakedowns have the additional benefit of aiding as a tool for conditioning.
As a general note, I would like to add my opinion that the focus of your trips should be the experience you have with the wilderness around you, not necessarily your interaction with the gear you brought with you. It is disappointing when I see crews carrying huge packs weighing 50 lbs, because that will detract from their experience by making them too tired to do side hikes and participate in programs. Just don't go to the opposite extreme either. If a scout really likes that pocket knife, let him take it. If an advisor wants that coffee mug, DEFINITELY let him take it. As long as everyone's pack weighs a reasonable amount, then your trip will be a success. Use your stronger and fitter members to help distribute the load better. That's part of what being a crew is all about.
And remember to be humble. The range of experience levels of the crews that arrive at Philmont is huge. Many of the participants have never been backpacking before their shakedown hikes. Most have zero experience with ultralight backpacking. Hopefully, going to Philmont will help them learn more about it. You're all there for the same purpose; to have the same wilderness experience. Remember that principle when interacting with crews that may not have prepared in the same way that you did.
I also have a minor correction to make to the article above. Doug Palmer is actually the Associate Director of Program for the Backcountry Camps. He is not the Head Philmont Ranger.

