In Bermuda, the inhabitants ...

Published by Roland M. Arsenault, Environmental Engineer at Catalyst Paper

In Bermuda, the inhabitants utilize limestone roofing which is used to collect rainwater and then conveyed to underground storage tanks.

Aquatic organisms is the major concern with water storage and treatment.  If the water has been tested and found to be safe for drinking with the exception of pH, it would be no worse than drinking carbonated soft drinks or coffee; which have low pH values.