Simple Hogwarts has such intense magic that muggle gadgets frizzle up and don't work. So we can only assume that sinks don't use pluming, or at least muggle pluming. So I think maybe it's safe to say hat wizards have magic pluming.
Abandoned pens and other such stationery stand a chance at purposeful usage, thanks to the Pen Printer. The device uses the ink from discarded pens to print on paper. The current tech may not support such an ambitious idea, but it’s worth the exploration, since many of us have bundles of uncapped and discarded pens in our drawers for no apparent reason.
Copy & Paste – Portable Scanner by Jayeong Yoon & Seulki Kim-Copy & Paste is a portable scanning and printing tool with which you can literally perform the said function. You don’t need your heavy printer or a photocopier machine. All you need is this handheld scanner that can transfer the images and text from one source to another source, but in the physical plane.