I picked one of the best contenders (an Aquasana), the water coming out of it still tasted completely awful, so I went with this RO option since it reduces TDS as well: https://www.amazon.com/dp/B09KRDK677
So far so good. My only wish is that it had a drainage hose, rather than having to fill and empty waste water from the tank. But it's totally workable. It gets our TDS down from 300-400 to 20. For now, I then pour that into the last zerowater filter we have left, which I imagine will last pretty long since it doesn't have much left to do at that point.
https://smile.amazon.com/gp/product/B09KRDK677/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Good alternative to Zero water filters
I went with this one since you can filter a jug for later use without having to wait at the time for water to trickle out: https://www.amazon.com/dp/B09KRDK677 (Rate is 1 Gallon per 14mins, though the jug holds less than that).
But I would consider this one if I were to buy another since you don't have to fill and empty a tank every time and I believe there is a waste tube that can drain back into the sink. Not sure how long you would have to stand in front of it to fill a bottle though... https://www.amazon.com/APEC-Water-Systems-Portable-Countertop/dp/B06XY66PZJ (Rate depends on water pressure, and is reported by one owner to be 1 gallon per 20–35mins)