I filled the vents in the Toxic Gas room with water (and had one left), and then there's this
I filled the vents in the Toxic Gas room with water (and had one left), and then there's this
I filled the vents in the Toxic Gas room with water, and they stopped spewing gas into the room. I left one vent as as proof of that.
I never thought of that! Great way to save a purity potion (very useful for on diet). Thank you OP