Hi! I was on a two-week (Viking) river cruise in France this past June and brought along my Pari Trek-S, Aerobika, and a small bottle of Dawn detergent. I asked for distilled water to be delivered daily and washed the various parts in the ice bucket, which was just the right size. Every four or so days I disinfected with hydrogen peroxide, which I bought when we first flew into Paris. The whole thing turned out to be easy-peasy. Maybe call your tour person ahead of time and ask if they can provide you with distilled water and if there's a microwave on board you can use? We had a wonderful time, and I hope you do too!