Join Date: Jul 2002
Thanked 4 Times in 4 Posts
Rep Power: 14
You don''t mention if the 40 gallons of existing tankage is in multiple tanks or in only one (I assume it''s the latter) nor do you state how many jugs of water you plan to take, in addition. Multiple storage containers in case of contamination e.g. in the main tank would be my main concern.
A watermaker is a wonderful thing but a) may malfunction, and b) the boat may not be in places where you can run it even tho'' your onboard supply is low. I''m amazed at how often I''ve heard fellow cruisers tell me their ''membrane seal failed'' or some other issue put their watermaker out of service.
You''ll need the amount of water you take, and you''ll use what you have. (Sorry for that sounding flip, but it''s true...). It''s just like ''how big should our cruising budget be?'' You''ll spend what you have and, since everyone has a unique amount, there are no hard/fast rules on what''s needed.
You might find it helpful to refer to John Neal''s/Barbara Marrett''s MAHINA TIARE, Pacific Passages book. They did extended cruising on a boat of your size & tankage. You''ll find John''s comments on issues like water - in an Appendix at the back - to be instructive.
Finally, to illustrate the ''what you have is what you''ll use'' concept, there are many techniques some cruisers use in lieu of spending the money and giving up the space required by adding tankage and/or a watermaker. On our last boat (family of 3, cruising in remote islands with no water supply ashore, and with a 50 gal main tank plus 2 jugs), we used salt water for all dish washing (when it was clean enough) and a plant spritzer to ''rinse'' all the glasses, dishes, etc. Removed the salt taste & build-up and used almost no water. These and many other techniques are available just by bumming around the anchorage and asking smaller boats what they''re doing...and you''ll meet neat people, too.
Good luck on the prep; and good for you, replacing that old wire before heading out!