Once you´ve chosen your wine, you may want to try it before you fill your glass. You will hear the waiter saying ´Quiere probar?´(Would you like to taste it?). To this you may reply, ´Sí, gracias´.
In contrast, during a professional wine tasting, they will use more professional wine tasting vocabulary, as we also do in English. In this case, your wine tasting guide will refer to ´una cata´ of wine (a taste). You may also occasionally hear this in extremely high-class or expensive restaurants, as it insinuates a more professional first sip of your wine, but this is not usual.
Let´s go straight to any problems. Does the wine taste off or bad? You can say ´Está mal, tiene un defecto´, which means that it is not that you don´t like it, but that there is a problem with the wine. Is your bottle of blanco (white) or rosado (rosé) a little warm? You can say, ´Está caliente´ (it is warm, or it is not cold enough). You can also ask for a ´cubitera´, which is a wine bucket (take care not to order ´cubiertos´, as this is cutlery).
If you would like another bottle of wine, you only have to say ´Otra botella de vino, por favor?´. You pronounce the word ´botella´ (bottle) with a ´y´ sound where the double ´l´ sits: ´bot-ey-a´. If you are familiar with word ´paella´, this might ring a bell: ´Pa-ey-a´.