Mulled Wine or Juice
Wines and juices were very popular during the Medieval period. To make your drink a little more festive, try adding spices! The Boke of Gode Cookery has recipes for both a mulled white wine called clarree and a non-alcoholic version using grape juice.
Image credit: By Buster.laroux - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=84053694