Replying to Amtrak question...never been before

taking the amtrak train from stamford ct, to kingston ri to catch a ferry to marthas vineyard. Anyone know how the train is compared to the ny metro north trains about drinking ont he train and bringing your own alcahol? I will be traveling alone and dont plan on getting ham beaned...just like a 6 pack fo some quality brews for the train and ferry. Anyone know how chill amtrak is with this. I know you can drink whatever on the trains into nyc. But im only 20 so obviously under age