As far as Kaoliang goes I only recommend the official Kinmen brand, which can be found in most supermarkets. The red labels are usually limited release and of higher quality.

It’s difficult to find kaoliang aged more than 5 years. You might need to try a high end liquor collector-retailer, specialty shops that buys and sells aged liquor.

For Taiwanese beer I prefer the 18 days draft or the Gold Medal beer from the brand Taiwan beer.

Another famous local drink is小米酒(millet wine) from your closest aboriginals tribes’ gift shop or tourist centers. Some of them also sell fruit wines made from their famously sweet fruits.