Just in case

[Ajax]

Amazon still have stock of Potassium Iodide in case you have not bought any yet.
You may never need to use it, and I certainly hope this is the case, but it might be worth getting some while it is still available. I'm not sure if local drug stores or pharmacists stock it but it may be worth a look.

Prussian Blue is prescription only, sadly. Use various fruit pectins to bind heavy metals instead.

I'm not trying to fear-monger. I hope we never need to use it.