Here are some links to articles on Water Purification.
Personally, I'm a little paranoid. So I would go with a 3 step Purification. You don't need to. I am just so.
My preferred method is, Sand/Charcoal Filter + Chlorine/Iodine + Boiling.
This article says, there is no need.
http://www.princeton.edu/~oa/manual/water.shtml
Another article I found is for Iodine purification.
http://www.instructables.com/id/How-To-Purify-Water-Using-Iodine-Tincture/
enjoy
Personally, I'm a little paranoid. So I would go with a 3 step Purification. You don't need to. I am just so.
My preferred method is, Sand/Charcoal Filter + Chlorine/Iodine + Boiling.
This article says, there is no need.
http://www.princeton.edu/~oa/manual/water.shtml
Another article I found is for Iodine purification.
http://www.instructables.com/id/How-To-Purify-Water-Using-Iodine-Tincture/
enjoy