Seaworthy, self-contained, and economical. Cruising sailboats come in a variety of ages, sizes, and prices. Here is an example of one from Latitude 38.
Starship - 340 Miles to the Gallon
Mexico to the Marquesas

Ann-Marie and Chris Fox, and Jonathan Busby used just 4.5 gallons of
fuel and 45 gallons of water during their Puddle Jump. The clothes
hanging from the lifelines were washed in saltwater with no fresh water
rinse. "We could hardly tell the difference compared to
freshwater-cleaned laundry," they say.
Photo Courtesy Starship
We love getting reports from folks who have just completed the Puddle
Jump from the West Coast to the Marquesas. Particularly when the
correspondents have done something cool. In the case of Chris and
Anne-Marie Fox — with crew member Jonathan Busby — of the Victoria,
B.C.-based Islander 36 Starship, the cool thing was that they
covered the nearly 2,900 miles in 24 days having burned only 4.5 gallons
of fuel. And that included what they burned to make electricity.

Saltwater showers and the occasional swim helped keep the sailors clean. While they were careful how they used fresh water, there was no restriction on drinking it. Photo Courtesy Starship

Photo Courtesy Starship
But that's not the trio's most impressive statistic. In 24 days, the three of them used a grand total of just 45 gallons of fresh water. That's just over half a gallon per day for each one of them!

The required equator celebration aboard Starship. Photo Courtesy Starship
If you have to bug out, you might as well enjoy it!
-fl