David Tyler wrote:
What's the capacity of these two tanks? A boat of this size won't like carrying more than 60 gallons; would a tank of 30 gallons take up the whole settee? With 60 gallons aboard, a couple can go for a three week passage, with a margin of safety, and ought not to need a watermaker.
Gosh, but you're greedy, David. We crossed the Atlantic in
Stormalong in 28 days on 15 imperial gallons of water and still had some left. (At least we thought we did, but when we pulled out the 5 gallon container, we discovered it must have had a pin-hole, because it was empty and there was water sloshing about in the locker.) I reckon with 60 gallons, a couple could sail for four months!
Generally, I have found 2.5 litres (let's keep it simple and avoid gallons) per person, per day to be more than adequate. Living here in the boatshed, I get through slightly under 6 litres a day, going mad with water!
Of course, if you insist on fresh water showers, your consumption will go through the roof. I go and put my coin in the slot here. Living aboard, I usually just have a 'bird bath' unless I need to wash my hair which requires lots of water.
However, I believe that Scott's wish for a watermaker is due to a sensitive stomach which objects to less than pure water.