"Contrary to popular belief, since the act went into law, only a few states prohibit minors and young adults from consuming alcohol in private settings. As of January 1, 2010, 15 states and the District of Columbia ban underage consumption outright, 17 states do not ban underage consumption, and the remaining 18 states have family member and/or location exceptions to their underage consumption laws."
So for the most part you can drink at home.