If homeopathy "theory" says that the water retains an "imprint" of other chemicals it encountered, clearly the tap water coming into your house is horribly contaminated with the fish pee, ozone (from UV purification treatment) and the pipes themselves. I briefly considered selling a device that would "reverse" those consequences so the water from your tap would be homeopathically neutralized. But it just seemed uneth…
You could probably still do it. It'd just have to be a distillation system that's not explicitly branded as a countertop water distiller but still describes its function and effects as such. You see plenty of examples of this on the market already as-is in different sectors. A part for a Ford GT could cost 500 bucks where the same part for a Ford Fiesta could cost 50.
Unless the part is something like a window-opener switch, yoi WANT that part to have all the extra engineering, higher spec materials, tighter-tolerance machining, and higher-level finishing that goes into making a high-performance machine actually perform at such high levels.
Moreover, even if the parts weren't fundamentally different despite occupying similar roles in the car, the mere difference in volume of production will dictate a far higher cost for the "same" part in a car made only in quantities of only a few hundred per year vs thousands per month ...