Lord Skimper wrote:As a side note the solar still does work when it is really cold, it is best to use a black plastic like a garbage bag and one doesn't need water rather just relying on the local snow or permafrost. This is a method often used for digging in permafrost and if you have a cup lets you get fresh water at the same time. If you have 50+ garbage bags you can set up a lot of these and make enough water. works even at -30.
Solar stills are not efficient though and a day of this may only produce half a cup. It does work for boiling water on a fire though and some will make a still cap for a boiling water pot to capture the steam and make enough fresh water faster. Copper is used to kill the contaminants in the water.
An UV light also works for killing bacteria.
And you can get uv light from sunlight. Put water in an clean empty clear plastic or glass container, lay on its side in sunlight all day. This will kill germs but will not affect chemical contamination.
Here in Wisconsin the surface water is frozen in winter. All of it. All winter long. Hence snow. Or knocking down the big Dr Zhivago icicles that develop on our house in winter, especially on the northwest side. If I have to chose between risking air pollution in my snow melt or dying of thirst... just sayin'
