I would add some Mountain House freeze dried meals. You can also make your own freeze dried meals that you make in ziplock baggies. I like MREs as well, but they can be bulky.

I would use the Katadyn Micopur tablets for water treatment tho. I believe they are better than your solutions. The Polar Pure is a good choice for typical water treatment, the Micropur for more questionable water.

I'm assuming your Gatorade is in powder form?