Autistic adults: how do you stim/self-soothe in public?

I just got home after a long, extraordinarily stressful, and sensory overload inducing appointment at a government office that I had to do to get some paperwork dealt with. Partway through it, I realized that some sort of stim/fidget toy would probably help stave off some of the worst of it, if I had something small I could keep in my purse. (Ideally something that wouldn't be too awkward to use in public... though I'm not concerned about looking a little awkward, that ship sailed long ago, haha.) Wondering if anyone here has some good recommendations on stim toys suitable for adults that I could bring with me next time, and/or any suggestions for unobtrusive ways to stim that I could do just on my own without needing anything special. I only found out I was autistic relatively recently (in my 30s), so most of this is still very new to me - any guidance is very appreciated!