Before you spend any money on water purification equipment (it may end up being an unnecessary expense), contact your water supply company and ask for the water quality report.
This is usually published annually or quarterly and it is most likely on their website as well.
This report will list all the water parameters, including treatment chemicals that were added that would reach the customer's home.
From there you can review the list of compounds and chemicals and research if those will cause any problems for the plants with the concentrations listed on the report.
You can't fix it if it aint broke.