pH of water used on plants

[ChasWG]

So I was searching the forums to see what pH the water should be for my orchids, but didn't see much. It seems to me that these plants would want a more nutral to acidic balance. And of course the tap water in my area is very hard. High quality, but hard.

Should I be treating the water to lower the pH and if so with what? I know the plants don't like all the chemicals we put into tap water, so what should I do or be watering with?

Thanks