The arrest comes after China imposed a sweeping new national security law on Hong Kong in late June.
The "Eye for an Eye" drink refers to an injury suffered by a medic while the "tear gas" eggs aim to bring to light police brutality towards pro-democracy demonstrators.
Carrie Lam announced a platform for talks to help the China-ruled city find a "way out" after weeks of rallies. Protesters say Lam has not responded to demands, which include democracy, her resignation and an enquiry into the use of police force.
The US president linked a humane resolution to anti-Beijing protests to China trade deal in tweets as Hong Kong activists plan more mass rallies this weekend to show their movement maintains public support despite disruptive sit-in at the airport.
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