Bold emphasis mine.A huge metal-clad hand gestured slightly, and one of the filled cups on the table drifted responsively into it. With a slightly admonishing tone the Dark Lord continued. 'Don't become too proud of this technological terror you've spawned, Tarkin. The ability to destroy a city, a world, a whole system is still insignificant when set against the force.' (sic)
p.36 Star Wars
This seems to me significant, because immediately after the events of Episode III, as told in Dark Lord, we read:
So, is this apparent example of Vader drinking from a cup 20-odd years later simply a 'nourishment through liquids' incident (does the mask extrude a straw?) or is it a result of an improvement in Anakin's condition or an improvement in the armour or both?He could take food through his mouth, as well, but only when he wasi inside a hyperbaric chamber, since he had to remove the triangular respiratory vent that was the mask's prominent feature. So it was easier to receive nourishment through liquids, intravenous and otherwise, and to rely on catheters, collection pouches and recyclers to deal with liquid and solid waste.
p.62, Dark Lord