Yes, you could make your own, but you probably wouldn't clean the bottle all the way, and you'd have a hot sunscreen martini on your hands, which is gross. Sunscreen does not go well with alcohol, which is why no one likes to take body shots off of responsible people. Fortunately, it doesn't happen much.
Ethan Wolff-Mann is an editor at Supercompressor. He knows what the word teetotaler is. Do you know what that is? Follow him on Twitter @ewolffmann.