The fact that he touched the bottle won't hurt anything. If he did read the bottle and decides to look it up online, well, there's nothing you can do about that. But if he brings it up to you, it might be an opportunity to talk to him about why you're doing this work, which doesn't have to be a bad thing. But don't get ahead of yourself. Maybe he didn't even notice!
Thank you, St. Michael, St. Expedite and La Santisima Muerte!