Searching for "holy grail", I mostly saw answers about how the grail legend developed. But-recognizing that first century Christians didn't care about what Jesus drank out of and the legend only developed 1200 years later- I'm just curious about how accurate Indy's idea of what a first century Jewish carpenter would be drinking out of.
Clay seems sensible, but I can imagine if you're eating a high holy day meal in a room given to you by some guy carrying water, you might be drinking out of precious metals. Maybe lead? You hear about Romans drinking out of lead cups a lot. Bronze?
I guess there's some question regarding class (a builder turned wandering preacher living off donations could be anywhere from desperately poor to fairly comfortable). And I don't know much about Passover rituals from that period.
Is there much evidence from archaeology from Jerusalem from that era?
It likely would have been some form of pottery. While Rome was capable of glassware in this period, we were far from Rome, and that would have been an incredibly expensive import.
This^1 archeological find shows a cup found in a wealthy ruin from old Jerusalem as being a pottery cup in a similar style as a modern mug.
The cup a historical Galilen might have had could be better represented in some of the artifacts from Qumran^2 in the same area. Again we see simple pottery cups, this time lacking handles.
The cup from the first source was a ritual cup, due to its engravings, so it is possible that a well to do carpenter might have a somewhat nicer cup in that style for religious events, but more probably then not there were at least the basic style of cups similar to the Qumran find.
EDIT: Do please bear in mind the quality of these items are still higher than what a lowly carpenter would have had. Both archeological sites seem to have been of a higher socioeconomic status, the latter being possibly from a Roman Villa.