I would step back and ask, How does it taste?
If you are making wine from grape juice the quantity of tap water involved is minuscule.
If you are making a kit and the water tastes good it will not affect the finished wine. ex the sparkling mango flavor water I looked at today (ingredients: carbonated water, organic natural flavors) had an out of the can TA of 0.2% and a CO2 removed TA of 0.01% (one drop of titrant). ,,,,, Water which is good enough to drink won’t buffer a kit and your big issue is acceptable flavor. ,,,,, That said some folks buy bottled water for their kits or if you refill your water jug to the W store that is reverse osmosis of the available city water.
Just curious, have you ever run TA on your tap water?