A large number of inexpensive and effective filters exist already. This is a problem you can already solve for yourself.
That’s not the case everywhere. This is not an individual problem in some countries, it is systemic. That sometimes includes the US. Even Europe has countries with undrinkable tap water.
At the very least, buy large jugs of purified water and use a permanent refillable bottle. It still creates plastic waste, but it’s a lot less than pounding down small bottles all the time. It’s also much cheaper, and if the bottle is vacuum-insulated, more efficient and enjoyable.
Small plastic bottles have their uses in some situations, but buying them all the time as your main source of drinking water is just silly.
I’m not saying we shouldn’t have safe drinking water provided to us by our municipal water supply.
What I am saying is that between the choice of purchasing expensive bottled water which this article and others say is effectively contaminated, is horrible for the environment, and largely comes from the same supply as municipal water does, vs purchasing a point of use filter system which can remove most harmful thinks in tap water, you will largely come out with better water for less money in the long run, with a point of use filter.
You are also doing better for the environment by doing that and getting a reusable bottle to take it with you. If you are worried about water on the go, look at something like a grayle travel filter or one of the other options out there already.