How can I mail alcohol to the US from another country?

I am planning a trip to South Africa, likely stopping at an airport in Germany for a long layover. What would be the best way to send/bring alcohol back home to the US? I am 20, so I don't think I'd be allowed to just pack it up, because I couldn't have it in the US? I'm stopping at some vineyards in SA, so I'd love to bring/send some back to my family.