Dear gift horse: Earl Grey is a UK brand of tea.
You could go as a tea bag, but so might a dozen others.
"Acid" was an early name for LSD. That's a tough one to
symbolize.
Edit: LSD is found in "smut" the black gunk that grows on grain. So some rye tassels (I think that's the word) well blackened with soot could symbolize LSD. Smut could be simulated with black spray paint.