From what I understand, drinking and eating can fall into the category of distracted or inattentive driving. So if your are drinking, eating, fumbling with a map, hitting buttons on the radio, etc, and you show sings of being distracted or inattentive, then you might just get pulled over and issued a ticket.
And as mentioned, it’s just good practice to place both hands on the wheel and don’t move until the officer instructs you to. It doesn’t mean you’ve done anything wrong or that you’re a criminal if you move, but it just makes their job a little easier. And if they’re putting their lives on the line daily to help ensure citizen safety, I think they deserve a little courtesy.