agree with above on sink , you can make it out of wood
Simple shower device with thermometor will suffice
Home depot filter device with filters the get out the crap
Vent the drain or you will not be happy,
Make sure you use a good plumber and electrician to set yourself up and find a local lab to service your used fix... DO NOT DUMP IT DOWN YOUR DRAINS.
not only will you be polluting the environment but if you have any copper in the drainage system you will rot it our within 1 year and pay$$$ dearly for this
good luck and happy printing