Any decent and god/xidada-fearing expatriate Hongkonger will have perused their daily Hemlock already while sipping homebrew or gourmet indie mocha, so I guess this pointer's for the tourists then...
McDonald's (HK) is infamously operated by the CCP's investment arm CITIC of course.One modest but potentially potent method of resistance could be to boycott pro-Beijing companies. To no-one’s great surprise, they are so concentrated that it’s hard to avoid them without starving yourself. They include 7-Eleven – a pillar of our urban civilization – and both Starbucks and Pacific Coffee. A good reason to hunt out indie coffee shops where they exist
With boycotts being one of the best non-violent protest actions that can be, umm, performed by anyone daily and without fear of retaliation I think having widely available resource also in English (think of the chil... tourists!) would be important.
A list of pro-freedom businesses might in fact be easier to compile, but that would automatically make them a target for the regime and their United Front enforcers. ¯\_(ツ)_/¯