Yes, they have a little market where you can buy prepared foods. You can buy a bottle, but not sure about glasses. You can take it all outside and enjoy at a picnic table. However, this was our favorite winery to visit, so you might want to consider a tasting. Do the cheapest one which is adjacent to the market.

We just did this yesterday. The traditional tasting is included. We were very pleased with the selections (everyone there was receiving the same types regardless of type of tasting it seemed). Our host was very knowledgeable and we received a few small pours as well. Definitely recommend with the cellarpass and then grab lunch on the grounds.

The price included three tastings, so it depends on how quickly you drink. If you have an itinerary with many stops, you should be in and out within 45 minutes without having to rush.

Yes, no sidewalks in Napa - better/safer to drive.

No. There is a wonderful deli where you can buy supplies for a picnic lunch. Most visitors do

Yes we are dog friendly! Hope to see you at the winery soon. Cheers!

We ran into an Italian host at Castello di Amorosa in August 2018, pouring wine for the tastings. He had only been in the U.S. for a few weeks and was working in Napa Valley for experience to take back to his families' winery in Italy. But I don't think you can count on that -- it'd be hit or miss whether someone was available when you were there. I agree with other answers that both wineries seemed to have a diverse employee base which might increase the odds.

I saw a lot of children of all ages when visiting this winery. I can't imagine it would be an issue.