Brigitta has less plans, she figures that a general atmosphere of drunkenness would suffice... The only person that she really definitely wants to get drunk is herself, just to give it another try and see if it's changed in the 5000 years since she last attempted it, she somehow doubts it.

She notices the 'Brig' part but doesn't complain as she pours the rest of the bottle in, Dean is slowly edging himself into the happy place that Anna (and possibly Xander and Buffy) inhabits and so is allowed to call her that, it's all good.

"There, all in, now we wait."