We drink wine. Or orange juice. Often communion is at house group rather than church, since then it’s amongst a small group of friends. One of us reads from Luke then serves the bread to the others and we pray together. We don’t have priests of course.
Once on business in Cologne, Germany, I walked past the Cathedral as they were holding an outdoor Mass. I wanted communion while away from home. I stood in the queue but didn’t know the right procedure. I think the priest realized I wasn’t German or Catholic but he gave me the wafer anyway, he could see I was sincere. Maybe he was a very naughty priest and I was a very naughty Baptist.

(Hope no one gets offended reading that, but you can tell your in-laws that a Baptist promises no one will bite them if they come to your church.)