When I was first learning, I set the enlarger on a typewriter table, and then put the trays in the tub, with the last tray being hooked to the faucet. If I were doing something similar today I would probably just take a tray and drill some small holes at one end, then put it under the faucet. I've also used the bathroom sink as a washer, either letting the overflow drain serve as a siphon or partially blocking the main drain.