Some tips for those of you who are protesting just to stay safe. Please remember to cover all of your tattoos, piercings, and really any recognizable features you may have. Turn your location off so no one can track you and have atleast two written emergency contacts.
If the police begin utalizing tear gas use a combination of 50% water and 50% Maalox/liquid antacid).
For pepper spray use dawn dish soap and water, vegetable oil, or milk in a spray bottle.
***edit: please feel free to add more tips and make sure to read the comments for helpful additions!
quick correction, please DO NOT use oil to try to combat tear gas or pepper spray, these bind to oils and adding more oil will cause the chemicals to stay on your skin longer. the best way to flush out the eyes is contact solution or plain water, then milk or antacid around but not in the eyes to help with the burning. but all the rest of this is excellent advice, thank you so much to all those protesting and all those spreading information.