I just found out about zein[0] the other day. It's made from corn. Not sure about ethanol resistance, though. Wikipedia says it is used to line coffee cups, for

I just found out about zein[0] the other day. It's made from corn. Not sure about ethanol resistance, though. Wikipedia says it is used to line coffee cups, for example. How often it is used, compared to plastics, I do not know. [0] https://en.wikipedia.org/wiki/Zein https://en.wikipedia.org/wiki/Zein