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How Do I Prepare My Phone for a Protest?
(themarkup.org)
This is a most excellent place for technology news and articles.
We're so focused on electronics here, but this part can save your ass:
The following is translated from the meager tactical training I've received: Emphasis on the pencil being small. You definitely don't want a full size pencil in your pocket if shit hits the fan and you get tumbled.
Maybe get a waterproof notepad. But make sure that you can easily rip out pages. Use a single sheet for all the info you don't want the police to have (like all the other burner phone numbers and such) That way you can rip that sheet out and swallow it, if you're about to be captured.
Also, about the scarfs. I don't know about the US, but at least in my own country, it's illegal to use a mask at protests. Meaning a mask would get you singled out and targeted by law enforcement.