Yes carry some purification tabs for sure. Could add: Platypus bottle(s) as an alternative to a full sized waterbottle. While less durable than lexan bottles they are much tougher than ziploc bags. They come in sizes up to 6 liters. They are collapsable and the larger ones roll up.

Should add: I just reviewed the Countycomm SOLED clip light in the campfire section -- check it out. I really like the little light, a handsfree light that weighs just 15 grams. Very functional headlamp if you have a baseball cap, but usable just clipped to your jacket collar or to your eyeglass frame if you wear glasses.