A group of scientists at the University of Groningen has tried to reverse-engineer the composition of Monkey Island’s grog, based on one scene in the game. They spoil a puzzle in the process, but I guess everbody in this blog has played MI multiple times.
The topic is a joke but the article is serious, so you might pick up one or two notions of real-world chemistry in there.
Pewter composition has varied over time, and historical alloys could contain lead. Modern pewter is generally tin-rich. Because the mug’s exact alloy composition is unknown, it is treated here as pure tin.
That makes sense for calculations and for the most corrosive results, but I’ve always assumed it was such low quality that it only barely didn’t dissolve even from just water. 