I'm fairly sure the iced tea in the MDRs is also the Fuze product from the soda machines. We took the galley tour on the Fantasy on our last cruise, and they had a setup back in the kitchen that was essentially identical to the drink stations in the buffet. No ice tea urn, but there was a Fuze tea outlet on the soda machine. I had also thought up until that point that the coffee they served in the MDR was brewed, because it tasted better to me. But no; same reconstituted coffee machines. Just goes to show how much expectation can affect flavor. The next time I had coffee in the MDR, it tasted just like the coffee out of the machines in the buffet.