I wouldn't drink the tap water even without the PFAS stuff. Under the sink RO is pretty cheap and easy to install. You get cheap good tasting pure water.

What you absorb through the shower / bath is a bigger problem. Whole house RO is crazy expensive and basically zero houses or apartments have any kind of easy way to run just shower water through a system. You are stuck filtering all the water you flush down the toilet or otherwise wasted water.

Edit: It's at least avoidable in drinking water. It's basically impossible to filter other goods for it. Not just food. Things like fabrics, containers, cleaning products, shampoo, floss, those face masks everyone was wearing for a couple of years, tampons. You could be getting as much exposure from other sources as from your water anyway.

I don't have a solution. Just pointing some things out. I don't know if a ban would have much real impact, especially if it wasn't a global 100% enforced ban. It seems likely we may be able to mitigate the harm through biotech advances long before we can get the stuff out of our supply chain, if it's even possible to get it out of our supply chain.