It would be really great if this addon could also track the highest level water available to your class like it does with other reagents such as anhks, fish scales, fish oils, etc...

The primary purpose of the addon is to handle spell reagents - aka programatically discerning which spells a character knows, identifying the reagents for those spells, and providing tracking/purchasing options for those reagents.

Water isn't a reagent for any spell, so this would involve writing an entirely separate logic flow - essentially a new addon. If someone wants to add this functionality and submit a PR sure, I probably won't action this myself though, sorry!