Ganymede has no freshwater plumbing. No big tanks means no hose runs, no pumps to leak and rebuild, no sink drain that needs a through-hull and shutoff valve. Instead of a sink, we keep a plastic tub discreetly under the galley counter where all the dirty dishes go. In the tropics, the tub gets put into the cockpit for dishwashing, where we draw up sea water with a bucket.