Ah yes, rainwater is always best for the plants. I think that is why my Calamondin is happy here in winter, even if it is cold, it is the only time of the year when we get rain. But we have no choice, we have 6 to 7 months of zero rainfall in my area, so all I can use is tap water. Thankfully it takes it...better this tap water than no watering at all.
