I could never get an answer from Exploration Products either, and gave up trying to wade through their web site with its mish-mash of products in no particular order. I got some small glass vials from here - C.L. Morgan Co. - and put a piece of Teflon plumber's tape over the top before screwing the lid down. It has worked fine so far, no leaks or corrosion of other kit items, and the 1/2-inch amber bottle holds 18 Potable Aqua tablets if packed judiciously.