A cheap Android phone bought on EBay. Have exactly NO data on it, but lock it with a long password. If they try to bully you into giving up the password, let the fucking pigs confiscate it.
Why? For $10 or $20, you can waste a lot of their time -- let them crack the encryption to yield exactly zilch. The best way to fight Trumpian authoritarianism is to gum up the system and overload the pigs who are "just doing their jobs" with unnecessary, wasteful work.