Boiling is my favourite method too. I do carry a few MicroPUR tabs and a filter straw in most of my kit set-ups though, unless there's snow on the ground or I know I'm going to be able to access water. Especially during our short summer, it's nice to be able to drink water without having to wait for it to cool down after boiling. (They're also an easier way to make potable water when I'm dealing with the kids.)