There's a place just outside Chio on the road to Mt Teide that produces and sells wine, worth a visit, a very nice Afrutada. There's also some good leaflets in the local tourist offices about Tenerife and Canarian wines and where to go to try them. The weekend market at Santiago del Teide will have some local wines for sale. A local once told me La Palma wines are very strong. A long time to go I know but the Fiesta of Tenerife food and drink held in Los Cristianos in April has some good stuff. Also heard stories of small bodegas that provide meals, tapas, to have while sampling their wines. There's a name for these, but I forget what it is. there was a good article about them in on of the glossy magazines that are available in the area just before last easter, because a new one was opening in the El Tanque area.