>>1010043If you have a camelbak or other hydration system, get a Sawyer Mini and run it in-line. Fastest, easiest, lightest purification method there is for solo hikers, and it also happens to be cheap (~$25) and last basically forever (100,000gal).
If you're doing a group hike or will be needing a ton of water to cook with, get one of the 2-bladder gravity filter setups.