One of the first things I do when I get to a campsite is set a fire and start boiling (while I do other things). Normally, to make a meal, but that doesn't necessarily mean a gas stove (I try to keep that for rain).

Some people don't even treat their water, no boiling either. I ALWAYS treat wild water (usually by filtering), my reason being that although North American backcountry water sources are fairly clean, you never know when you may find yourself in an emergency situation, and that's NEVER a good time to get diarrhea (and the resulting dehydration).