We are fellow SF Bay sailors and I would be happy to share our 8 month Mexico cruise after the 06 Ha-Ha.
As to the water issue we installed a water maker which freed us from chasing drinking water. The water was great tasting a caused us no health problems and we even made water in Zihuatenjo bay which is shall we say - bacteria rich.
The down side to a full bore ocean water maker is of course the expense and then since we have been back in the Bay it just sits and gets back-flushed on a regular basis.
Lots of folks take on tank water at the more upscale marinas which is usually treated water and is said to be potable. They use it for everything including coffee etc. Then as almost everybody in Mexico does, they drink bottled water which is sold everywhere.
I have installed and used a Costco undersink R/O watermaker at home and they work well but understand the only a percentage of the water going over the membrane goes through the membrane to become product at something around 5 gals per hour. This would mean you would need a shore side water supply to run a long time to fill your tanks.
Hope this helps.
Last edited by harryhoratio; 09-05-2008 at 12:48 PM.