I was going to suggest an inexpensive provodine-iodine swab as multi use addition to the kit, but primarily a water treatment option... katadyn ClO2 are a little pricey for the troop's budget...but doing a search,the recommendations for dilution run from 2 to 8 drops per liter of water....does anyone have any other or more up to date numbers?...

you might repackage some Aquapure/Potable Aqua tabs...couple of tufts of cotton,small straw, RTV silicone end plugs