My seniors need hot water and our own electronic kittle is not allowed to be onboard, so we have to fill our giant bottle at the buffet. We will follow the rules to use a new cup each time, which is convenient for us, though not so convenient for the dish cleaning staff team 🤭 I am wondering if I can use the glass cups to get hot water instead of the ceramic cups because the glass cups seem to hold more water so I don’t need to “waste” a lot of cups each fill.