@Richman They're all beer. The "Ebisu" they mentioned is most likely Yebisu by Sapporo. They're all pretty standard beers as far as I'm aware, though Yebisu seems to get better ratings than the other two on English beer sites. The point here (to anyone wondering why this is important) isn't so much that the beers she likes are cheap, but rather that all of the drinks she prefers are
beer. Just beer. Wine and cocktails with fancy liquor in them are seen as more refined drinks than beer, and the new teacher thinks that someone like Kusanagi should be refined, like she is in her fantasies. But the real Kusanagi has an unrefined drinking palate that consists solely of beer, and thus the new teacher's fantasies are being shattered little by little.