I did suggest the wooden-boat option, but as Polyglot mentioned, a sink is not actually that essential for most printing - just a (very) nice-to-have. My darkroom (a.k.a. spare bedroom) has no water inlets or outlets or sinks of any sort or size. I just have to carry trays over to the bathroom for washing prints, or the trays themselves.
On the 'wet' side I use a Novatech processor plus developing trays of various sizes with occasionally a frame shape of 30mm square wood taped at the edges of the desk, covered by a sheet of builders-polythene, taped down around the edge of the frame. A very temporary solution, and I rarely do it because any small splashes are absorbed by a newspaper covering of the desk (that is binned before it dries). Now I have jinxed myself and will drop a 20" tray . . .