Boomer
If you're going a long ways you probably should not rely on finding clear drinkable water, boiling takes too much energy and requires time to boil and time to cool, and the steripen battery situation might not be good and it could fail, but if you weigh the batteries and add a second steripen it might be fine. I don't know if you can still buy one, but I've been using a PUR hiker in the Sierras for over a decade without a problem or need to change the filter. It is also the fastest water filter and when mosquitos are sucking your blood it allows you to spend less time squatting by the lake.
Jim