I'm a water nerd.
For the most part, flourode, chlorine and TTHMs are the main concern for muni water.
These can be mitigated simply by putting drinking water in a pitcher. These volatiles will evaporate out in an hour or less.
For cooking, nearly any in-line activated charcoal filter will work but REPLACE every 3 mos.
RO is overkill unless you have really bad minerals or brackish water.
Berkeys are... Expensive. But good. Kangen is super expensive but ok- they filter out nutrients... Then replace them with their own nutrients$ for taste.