In our experience, boats that have watermakers are happy to give you a fillup - it allows them to run their system and avoid the chore of a layup. We came back from Canafa into Little River (Cutler) with about a gallon left - looked in vain for a dock with a hose bib. Only other boat in there was a HR54 - gave us 35 gal for the tank and 5 for the sun showers with no problem (200 gal FW tanks with R/O). Plus, we gained a friend.