Merilyn Allaryr may well have brought Mintwater to Baldur's Gate and possibly to Faerûn. A moon elf with many centuries of wandering and learning under her belt, Merilyn developed a fondness for mint on her travels and catalogued hundreds of varieties of the herb, noting different properties, uses, and flavors. By some reports, her office at the Stones is lined with jars of dried mint leaves and terrariums of living mint plants, and she has a tome that records many hundreds of recipes for Mintwater.
As far as Merilyn is concerned, there is actually no such thing as Mintwater because it is too simple a name for such a complex idea. Every recipe has its own charms and idiosyncrasies. There was a time when anyone ordering Mintwater at the Stones was met by an overly enthusiastic Merilyn and her giant tome. After several minutes of anguished browsing, patrons would usually order something else or just leave. Merilyn was eventually persuaded to leave the customers alone, and as with every other venue that serves Mintwater, the Stones now offers just one recipe. Unless, of course, you ask to see the book.