Drink water instead of soda, alcohol, other sugary drinks. Eventually you'll find yourself to be an expert water connoisseur and prefer water over pretty much all beverages.
I have a water filter at home. I never use bottled water. Almost every public space also has clean and safe water so if you bring a reusable water bottle with you, you'll have free water everywhere.
There's a difference between high quality plastic performing filtration while it's cold plastic and cold water vs crap plastic that's regularly exposed to high temperatures during transport and storage with the same water contained the entire time.
Maybe, I'm no expert. But, I've seen a test showing a consumer water filter increasing microplastics by 1000%. Could just be only that specific filter or filter type. I believe it was a Zero filter, which I think uses resin beads for ion exchange.
Interesting, I used ZeroWater for a while ... and know others that do. But yeah, searching around it seems it's only ConsumerLabs.com that came up with that result and all other filters were removing (at least some percentage of) microplastics.