There are indeed laws that prohibit people who manufacture alcohol from also being the ones who sell it to consumers. They're not selling it.
You can label things any damn way you want to label them, if you're not selling them. If you want to go home tonight and print out a label that says "Vinegar", and paste it on your Vodka bottle, I promise you won't be breaking any laws. If you then give that Vodka to your friend, you're still not breaking any laws, provided your friend is an adult.
The level of hysterical paranoia by other posters in this thread is confusing.