¿Esto suena natural? About a wine bar in Japan.
You can drink 20 kinds of wine for all-you-can-drink. They are selected from uncommon great wine brands of all over Japan.
Wine of popular brands and big companies is not always delicious. It depends on your own preferences though.
This bar backups small scale wine breweries. So you can drink many types of rare and local wine here.

"Popular wine brands and big companies ARE not always delicious." Use "are" since you're speaking about two things, the brands and the companies. It's plural. Also, don't say "wine of popular brands". "Popular wine brands" sounds more natural. Also, that next sentence shouldn't be separated. Instead it should look like this: "popular wine brands and big companies are not always delicious, however, it depends on your own preference. "

Again, with the sentence after that, take out the period and add a comma. "This bar backs up small scale wine breweries, so you can drink a variety of rare and local wines here!" That sounds better and more inviting, and like a better closing sentence :)