For years I used a product called Polar Pure for water purification when weekend backpacking. It was an iodine based solution, so not great for a thru-hike, but fine for a week or less. Specifically, it used iodine crystals which slowly dissolve over time and can work for a couple thousand treatments.
Unfortunately the company that makes the product is based in California where iodine is on a list of substances the state is changing regulation on in an attempt to stop crystal meth production.
Are there any companies in Europe or elsewhere that can ship legally to the US that produce something similar to Polar Pure?
The features I am most interested in is a small container that is able to treat thousands of bottles of water over time.