You cruise in the Sahara desert? LOL
Most marinas in the Bahamas, a
very real cruising destination for us North American types, are
already charging 50 cents a gallon for dock water, and the price keeps
going up. For people making long passages, water capacity is always
an issue, and it's really nice to get one or two good showers a day
without worrying about draining the tank.
You'd probably be surprised at the number of long range cruisers who
are already equipped with water makers for exactly these reasons.
There are other ways to supplement fresh water without adding the
expense and problems of a high maintenence watermaker. I'm not
surprised by the number of cruisers who think they can't live without
a watermaker and hot showers.
For fully half the year in the monsoon areas there is little or no
rain. You replenish water supplies by either going ashore and toting
it back to the boat or a watermaker :-)