Obviously the tanks are optimized for whatever it is they do (emulating senselessness?) but is it possible to emulate that?
How much epsom salt would you need and would it be cost-effective and safe to go down the drain relative to going out to an actual tank?
Please tell me it isn’t completely impractical and it could be done :)
There are a few DIY guides out there.
I don’t think a bathtub is the way to go. They aren’t long enough for most adults to float in. Plus they take a lot of salt, so either the bathtub is dedicated as a sensory tank or you have to drain it / refill it frequently (which gets expensive) in between using it as a normal bath.
The salty water can go down the drain though.