Just bumping this topic because I'm on the MSC Seaside right now and rather disappointed that for lunch and dinner the buffets only have water. A choice of lemonade or iced tea would be nice, but nope... Just water (not very cold), ice, and coffee. It's a strange choice for what is otherwise a well stocked buffet.
Breakfast is better with some juices, although no orange juice after the first day. The hot chocolate is also good in the morning.