There's no "this can be used in tradeskills" tag but according to Alla it can indeed be used in making 3 globes of purified water per reed. Post if this actually works please so we know. It won't sell to merchants so I typically just destroy them when I get them.
my druid has been foraging these in quite a few places, but would like to know what they are used for. working on brewing skill, so would be nice if they were for something.