I went to airframer site to get a few names. In the Boeing series found general ecology, which  does in line purifying units (filters) and an interesting potable water tank supplier, Yokohama Aerospace US. You'd think it would be 'easy' to find some add-on arrangement with latter for IWG's ultra-violet system...the site says it has done 9000+ instals. Anyway, imagine IWG are sorting out potential jv's with existing OEM and retrofit water system firms like latter. General Ecology would be a direct competitor. The recent FACC design agreement would mean that the big players must be aware of IWG but the larger commercial aircraft business must be  fairly hostile to newcomers. Just goofing around as I sip my wine. GL