You can do nothing really, other than reduce your dose by drinking filtered water where you can or advocating for agriculture that has all of its inputs and out

You can do nothing really, other than reduce your dose by drinking filtered water where you can or advocating for agriculture that has all of its inputs and outputs filtered (which seems to be more of a sci-fi premise than anything realistic given vertical farming type operations are extremely cost-prohibitive/don't make actual sense). Microplastics are also in the air you breathe, so perhaps use a great air purifier at home or wear a cloth mask to reduce exposure if you really care. And as a small act of protest and helping in a small way, you can try to avoid purchasing products that use these (easiest with microplastics than PFAS as with microplastics there at least is often a label that the good is made of plastic or synthetic fiber, PFAS is usually unlabeled in goods, as the chemical industry answers to no one). And I guess finally you can vote for environmentally-friendly parties, and advocate for environmental regulation politically.