A similar entry appears in the Wheel of Time Companion confirming the information available in the main story arc.
Oosaqui is a feremented Aiel drink made from zemai, that looks and tastes a little like brown tinged water and is stronger than brandy (TSR, Ch. 57)
"The next time they call for wine, if the gai'shain bring them empty cups, they will no doubt get drunker than we can on oosquai." (Enaila to Jalani about the Thunder Walkers, Lord of Chaos, Chapter 4)