Watermain- new device in disposals to regulate water in station

[Ikea]

I think having chemicals that magically teleport across the station is just odd, and is too niche (would only be useful as antag on roleplay (due to classic not really using showers and sinks), and poisoning the entire station requires a lot of roleplay to go alongside of it). A large system spanning piping system would make more sense, however that is a whole another can of worms, and adds a large mapping requirement for something thats usage is pretty niche. Personally I think the best of both worlds would be to do it tg style and have a nearby container of chems near the shower generally in maint that the shower draws from through the usage of reagent pipes.