Creative 21st Birthday gift idea! Awesome gift idea for a guy (or a girl): Hangover Recovery Kit. Homemade gift that is super fun and easy to put together. In this case, I made this for one of my guy friends for his 21st! Consists of (1) water, (2) gum, (3) hangover kit: advil, asprin, and bandaids, (4) granola bars, (5) chapstick, (6) mouthwash, and (7) the little details that bring the whole birthday basket / kit together.