« Reply #2 on: Thursday 02 June 22 23:01 BST (UK) »
To my mind any building with the name "flask" has to do with the selling or purchasing of a container (flask) to hold pure Spring water bubbling up from the ground. Otherwise people had to drink water from industrial contaminated rivers, or rivers/springs used by animals.
https://alondoninheritance.com/tag/the-flask/“The Chalybeate Waters at Hampstead being of the same nature and equal in virtue with Tunbridge Wells and highly approved of by most of the eminent physicians of the College, as likewise by many of the gentry who formerly used to drink Tunbridge Waters, are by direction of the Trustees of the Wells aforesaid, for the conveniency of those who yearly drink them in London carefully bottled up in flasks and sent to Mr. Phelps Apothecary at the Eagle and Child in Fleet Street every morning at the rate of 3d per flask and if any person desires to have them brought to their own houses, they will be conveyed to them upon their leaving a note to Mr Phelps’ aforesaid at 1d more, and to prevent any person being imposed upon the true waters and nowhere else to be procured unless they are sent for to the Wells at Hampstead, and the said Mr. Phelps to prevent Counterfeits hath ordered his servants to deliver to each person who comes for any of the waters aforesaid, a sealed ticket viz: a wolf rampant with 7 Crosslets.
Note! the messengers that come for the waters must take care to return the flasks daily.”
Aberdeen: Findlay-Shirras,McCarthy: MidLothian: Mason,Telford,Darling,Cruikshanks,Bennett,Sime, Bell: Lanarks:Crum, Brown, MacKenzie,Cameron, Glen, Millar; Ross: Urray:Mackenzie: Moray: Findlay; Marshall/Marischell: Perthshire: Brown Ferguson: Wales: McCarthy, Thomas: England: Almond, Askin, Dodson, Well(es). Harrison, Maw, McCarthy, Munford, Pye, Shearing, Smith, Smythe, Speight, Strike, Wallis/Wallace, Ward, Wells;Germany: Flamme,Ehlers, Bielstein, Germer, Mohlm, Reupke