You do not need to worry about food
I know this sound stupid but when your group tour arranged meals nicely, you just need to step in and your meals are ready. Again, this is heavily dependent on the quality of the travel companies and you can spend lesser time in waiting for food when everything is arranged properly.
Thus, tour guides can bring you for local food or places for snacks (depending on travel packages). There are also theme tours such as gourmet tours.