Finally unearthed my Jane Austen Cookbook
which contains recipes that were actually used in Jane's household or from contemporary sources. i'd forgotten about Negus, a popular party punch, "made of wine, hot water, lemon juice, sugar, and nutmeg...During the early Regency it was practically expected, along with White Soup at balls."Recipe from the Jane Austen Centre
They give a non-alcoholic suggestion.
White soup is not specifically mentioned in Emma
. It's a rather elaborate chicken soup, enriched with ground almonds & egg yolks.
Don't forget a half a glass of wine. A small half glass -- put into a tumbler of water. To be taken with the apple tart (made with fresh apples, not "unwholesome preserves").