JB, scan the archives. There are a bunch of different methods, most of which you would be expected to use with some duress and under some risk. Lots of chemical nasty shi$t that need to be triple-distilled to get rid of it.
I am NOT drinking even boiled water that some cow crapped in. What is that? Beef broth?
I'm saying carry the good stuff to cook with and drink with. Don't spill a drop of that.
My kitchen has mountain snowfield meltwater, properly cleaned. Then I carry 3 x 20 liter water cans of that in the back of my GMC Suburban from now until freeze up. Some days, not so much for me but people that took off with little thought to resources on the road.
My home source is out these west windows.