Easy to get some water in Raiatea at the marina. Also, at the gazoline stations.
In Borabora there are 3 spots (dock in town, dock in bloody mary restaurant, dock Borabora yacht club).
In Huahine dock of the yacht club. Best place in Huahine.
Main cargo ship dock with the dive center (and Relais Mahana yacht club).
In Maupiti there is no water available.
Clients will also be informed during the chart briefing.