Update: Apparently "Kennedy's Lisbon Diet Drink" was a non-alcoholic concoction of sarsaparilla and liquorice.
https://www.ebay.co.uk/itm/MEDICINE-John-LEAKE-Dissertation-...
"Some of these drinks are unfamiliar to us. “Lisbon” was probably a white wine from Carcavelos, near Lisbon. “Mountain” is a sweet and luscious wine from Malaga, in southern Spain. “Sitgis” is probably a muscatel or malvasia wine from Sitges, a port 20 miles southwest of Barcelona. "
(it's unlikely to be that non-alcoholic drink, as he's specifically recording the alcoholic ones he's consuming)