Not sure. No one size fits all solution for sure.
  • more durable plastics, to begin with
  • better disposal of plastics. Lots of the micro plastics enter the water ways and then the human body through consumption of contaminated food. So reducing single use plastics might have some impact here
  • related to previous point, better chemical breakdown techniques of plastic. There are some bacteria that have been shown to eat plastic
  • alternative packaging. Micro glasses are also a thing, but haven't been studied much yet.
  • boiling water before consumption has been shown to drastically reduce plastic content in your water.
  • ...