I pretty much knew what people drank who came to visit. I had people who only drank tea and had some friends who were coffeeholics. For the coffee people, I always brewed coffee - no instant.
If there was somebody who I didn't know well, I think I just automatically offered a cup of tea.
Our first visitors from England were here several weeks ago, before our furniture even arrived. First, they spent a week on a ranch in Wyoming and then flew home, diverting for several days in Chicago. They were gagging for a proper cup of tea and were delighted to see that, despite no furniture, we had a kettle (and coffee maker). Priorities!
And if somebody came over with a problem or was feeling low, let me just say "I'll put the kettle on!"