A tag that general is probably not that useful. Beer questions that are about a particular type of beer (stouts, IPAs, etc) are tagged by style now, and we should keep doing that. I'm having trouble seeing the utility of also tagging them "beer", especially since we want this site to grow. That'd be a huge number of questions, right? How would you use that?
So, you might ask, what about wine? Yes, you're right -- that's going to cause the same problem later. (I hope you don't mind my putting words in your mouth like this. :-) ) Wine is newly in scope and there aren't a lot of questions yet, but in time I expect we'll see subdivisions there. Perhaps we should go ahead and start with red-wines and white-wines right off the bat.
Now some questions really don't care about the type of beer or wine; they're questions about storage or production or something else. In those cases we have other tags already. So there might be utility for tags like "beer, any type", but we should study our existing questions before deciding (and naming) such a tag.
Tag ontologies are hard, and on most sites I participate on, the tag set evolves, inconsistently, over time. Trying to organize all the things systematically is probably just going to cause you to pull your hair out.
Finally, when doing large-scale retaggings, please try to not break the front page too badly. It's better to either do these things in smaller batches so that they don't push new questions out of view, or announce in advance that we're going to bump tons of posts on such-and-such date so people will be expecting it.