I'm thinking that a cast or crew member of "Downton Abbey" was thirsty. In this promo picture for the upcoming season, you can see a water bottle on the mantle behind these actors.  That's not helpful for a show that takes place in the early 20th century.  Pssst.  Water bottles weren't around aren't until the 1960s. (Look to the right side of the picture in-between the vases)

The publicity image released by Downton Abbey. Photo: Downton Abbey