As stated in the article, this isn’t a big problem for communities with centralized water treatment systems, rather for individual homes drinking well water which is contaminated by agriculture.

In a municipal treatment plant you have a few options for removing nitrates including reverse osmosis (membrane filters with very small pores, allowing them to reject very small molecules), ion exchange (swap nitrate with another, less harmful ion), or biological treatment (use microorganisms to turn nitrate into nitrogen gas).

In your home, reverse osmosis is really the only feasible option, which can be expensive to install and costly to maintain. Ideally, some sort of tax on fertilizer would be used to pay for these in house treatments, but that would increase the cost of food.

There are varying levels of Aphantasia, for my partner it is complete but for you if may only be partial. The wiki page I linked discussed it a bit.

https://en.m.wikipedia.org/wiki/Aphantasia

My partner has Aphantasia. Brains are strange! She cannot visualize in her mind which makes it very challenging to do certain tasks and many things she does are based on muscle memory. Also interestingly when a song gets stuck in her head it is like she is making all of the sounds with her inner voice. For me, I can hear the song like there is a recording playing in my head.

Sadly this is pretty common. Here are some nasty pictures from a recent one in greater Vancouver.