Diluc is not fond of alcohol as he does not like its taste and that it clouds his mind when he tries to work. He prefers non-alcoholic drinks such as grape juice and apple cider, which he had ordered developed upon his return to Mondstadt. This does not appear to be well known by many however, most likely as a result of him being the current owner of Mondstadt's largest wine producer. He even expresses surprise when he learns that Diona also loathes alcohol, since he thought he was the only one.