I've read on the Oceania board over at CC that there is good quality water available from taps on the ships, so you can probably refill your bottles that way if you like. I'd check to find out which water is potable first though.
Wendy ------ Booked: Uniworld Egypt, 2015 Tauck Amsterdam to Budapest, 2016 Paul Gauguin, Societies & Tuamotus 2016
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