This post and its children make me think Verniy has a little Roshi in her.
This proposal turned out to be correct given the later pages. She therefore is actually drinking whisky (or Vodka) but changes it so the others can't drink it too.
White!I know it's late, butAh!So... so cool!BAAAAAM!*clatter*T-That's...!How... How adult!Ooh!I was wrong, that's...Sak*ma Drops!!!Ahh...I have become Верный.The dealie with whisky or something in it that you can chug from! SAKUMA
D*OPSChug!