Maybe this specific one, but microplastics are in everything you eat and drink, the presented article merely points out that this specific use case produces lost of micro plastics which are ingested by children.
Can you elaborate? Like is it somehow worse to buy a bottle of water and refill it periodically over the course of a year, than to let the original contents sit in my house for a year and then drink it? If so, I'm guessing the extra handling (squishing, crunching) is the main culprit? Or does leeching occur more readily when the contents are refreshed, as opposed to static contents that already reached equilibrium? Or is the pH (or other characteristics) of the original contents less likely to cause leeching than arbitrary contents?
I do drink a lot of bottled water, and while I don't reuse bottles I'm still considering how much just pouring the water from the bottles into a glass would help.
The better wording of 'stop reusing bottled water bottles' to avoid plastics would be 'use glass or metal water bottles'.