A lot of good answers here; ...

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A lot of good answers here; I concur that drinking water with a pH below 6.5 is probably not the best. Low pH is also an attribute of distilled and reverse osmosis water, and these water sources are not considered harmful, however.

If the rainwater is purified with ozone, then the oxygen molecules that are released in that process can combine with some of the free hydrogen ions (pH is a measure of free hydrogen ions, a lower number means more are present) which makes more pure water. Another good way to buffer the low pH is to store the rain in a concrete tank rather than plastic or metal. Calcium or sodium bicarbonate are good buffers, as well.

Just plain aeration, that is - introducing a flow of air bubbles into the water like an aquarium, will also help.

It might be worthwhile to identify the element that is causing the acidity. It could be carbon (carbolic acid), nitrogen, (nitric acid), or sulfur (sulfuric or muriatic acid). An analysis would help.