Eruv chatzeirot in a hospital or on a cruise

Hi,

There is no need to have each hospital patient or cruise participant participate in an eiruv chatzeirot [the joint meal dedicated by residents of adjacent private domains, which licenses them to transport between those domains] in order to be able to transport between their rooms. They all depend upon the administration of the hospital/boat for their meals and needs, and so they constitute a single unit.

(Rav Moshe Feinstein, Igrot Moshe Orach Chaim 5:20:28)

Have a great day,
Mordechai