Just curios, do you know someone with HepC that you shared a drinking glass with or are you just concerned in general.
I would not advise drinking glass in the first place, let alone sharing the experience with someone. ;)
No you cannot get hepc not even if it is a glass full of blood. Need blood to blood contact.
Only if you had an open sore in your mouth and you were drinking a glass of someones blood. Of course the blood would have to come from someone that indeed was infected with Hep C virus.