How one cruising couple’s self-sufficiency system turns comfort into freedom
By: Walter Thirion
Fresh water defines independence at sea. It’s one of those quiet realities of bluewater cruising that separates weekend sailors from voyagers. Out here, surrounded by an endless horizon of saltwater, every drop we carry—or make—represents safety, comfort, and freedom. On SV Wanderlust, our 2014 Passport 545 Aft Cockpit, water management isn’t an afterthought. It’s a system, a discipline, and a way of life.
While every boat’s plumbing and tankage differ, the underlying principles are universal. What we’ve refined aboard Wanderlust reflects what we believe every serious bluewater boat should have: systems that are reliable, maintainable, and completely self-contained.
We approach water the same way we approach seamanship—with care, respect, and redundancy. Whether we’re weeks offshore or anchored in a remote atoll, we know exactly where every gallon comes from, how it’s stored, and how it’s used. That knowledge doesn’t just keep us comfortable—it keeps us self-sufficient.
Knowing What’s in the Tanks
We almost never fill our tanks from a dock or shore hose. That surprises some people, but it’s deliberate. When you live aboard full-time, what goes into your tanks matters. Dock water can contain sediments, chlorine, or bacteria, and many marina systems aren’t well-maintained. Our philosophy is simple: if we don’t know its source, it doesn’t go abroad.
All of our freshwater is produced by our Spectra Cape Horn Extreme watermaker (now sold as the Cape Horn Extreme 330)—essentially a compact desalination plant on the aft bulkhead of the engine room. That control gives us confidence. The water is pure, tastes good, and doesn’t risk contamination.
Once a year, usually when in a marina, we “shock” the system with chlorine to sterilize the tanks and plumbing. It’s a quick preventive measure to eliminate any biofilm. Beyond that, the system remains clean year-round. After tens of thousands of gallons and many ocean crossings, we’ve never had a single issue with tank contamination.
I had the same Spectra setup on my previous sailboat, and after nearly two decades of living aboard and making all our own water, we’ve never had anyone get sick from our supply—or from food prepared with it. That’s not luck. Its consistency: clean tanks, disciplined maintenance, and a system we trust completely.
Interested in what comes next?
