You can have what I'll have, which is a dual system (actually a three-parter, if you include a seawater tap). This is pressure water, hot and cold, on demand, from a FloJet or similar set-up, and then a separately piped foot-
pump for low volume, no-amp passagemaking or anytime you are off the dock.
An adjunct to this is a proper manifold to isolate both "services".
It demands planning and a somewhat crowded sink, but it's all much easier than buying a watermaker.