How do you know they don't have an option of beer or cider?
If I were the producer of The Restaurant, and I got a letter saying "What about beer and cider", I'd send one back saying the drink choice is entirely up to the celeb and nothing to do with Vision Independent Productions, its subsidiaries or shareholders.
I really don't think the Restaurant is a suitable target. I don't think there is one -- Irish telly doesn't even have any decent wine or other drinks content.