I like to have some whiskey with my tea on Shabbos. If the tea is a kli rivii, can the whiskey be mixed in hot tea? Kettle (kli rishon) to cup (kli shni) to thermos (kli shlishi) to drinking cup (kli rvii). Then whiskey is mixed in.
It is permitted, even if it isn’t a kli rivii. Cooked liquids may be placed even into a kli shleishi.