Deliver a clean, labeless bottle to say "homebrew inside" like nothing else. If you're gonna do this, at least put a wrinkled paper bag on it for character.
Use a Post-it Note
Scribble some chicken-scratch handwriting on a note and be sure it sits in the back of the recipient's refrigerator for months.
Make a Label
Now we're talking!
What is this brilliant concoction of alchoholic goodness you've placed in my hand? Is this from a craft brewery?
To make labels for your homebrew, perhaps try a simple and free site called beerlabelizer. There are many different label styles to choose from and you can print or save as needed. Some people criticize the amount of info that can be entered, but it does have all of the basics. Let us know if it works for you!