A Long Drink was a virtual representation of one of Bayek's genetic memories, relived by Layla Hassan through the portable Animus HR-8.
Description
Bayek found the riddle in the House of Life, a large temple on the south-western end of Siwa, sitting on a table under a canopy on your right when entering the rear courtyard of the temple.
Riddle
In Siwa, come find me at the bottom of the only bowl big enough for a god.
Outcome
Bayek found and recovered the treasure.