May want to carry large goggles that fit over your eyewear or just to protect your eyes in event of tear gas.
Bandanna try using old t shirt to cut up as it’s larger more comfortable. Should probably have several bandannas just in case a stranger may need one in case of gas.
Perhaps it's strange or perhaps it's because I'm not an idiotic, anti-American, idiotic, criminal scum who has no respect for laws, authority, or others, but in my 60 years of life, I've never had to worry about carrying things in case of tear gas.