I want my PFS character to spend some gold on drinking and tempt others to do it.
However, the rules that I have found lack actual price listing of different alcohol beverages.
Where can I find those prices?
They're listed in the Goods and Services item list. There's a bunch of alcoholic beverages there, ranging from common ales and meads to absinthe, whiskey and wine. Most of them are sourced from the core rules or the Ultimate Equipment supplement.