What I'm looking at here is a smallish bottle, 1/2 oz (15mL), of Betadine (povidone-idione 10%), which equals out to 1% available iodine. Small enough to fit in a PSK, very versatile. You can use it to wash hands, too, even tho Beach doc has different ideas.

Personally, you can't beat a small bar of soap and frequent handwashing for preventive maintenance.
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