I would highly recommend a good water filter over the boiling method. Boiling is a pain in the ass. You gotta break out your stove, boil the water, then it's gotta cool before you can drink it. You still end up having to lug a day's worth of water on your back.
"People say that marijuana smoking is going to get in the way of my career. I say to them that on the contrary, my fighting career is getting in the way of my marijuana smoking." -Nick Diaz