I've been having a read about the probition on comsumption of alcohol for under-21's because I thought it might be fun to see if we could mix this whole 'hey but I could drink at home' thing up with our slow slow wine plot. Anyhow I found this interesting snippet:
Some States also allow exceptions for educational purposes (e.g., students in culinary schools)
So it's quite possible he could get roaring drunk and claim it was just homework. Also that 21 thing - Charlie would be very sympathetic about bending that rule til it squeaks.