Painting the town blue

A group of volunteers trying to show you the importance of clean drinking water will be painting a three-mile-long blue line down Boylston and Newbury streets today. They're promoting the Tap Project, which attempts to bring clean water to folks around the world not fortunate enough to be served by the MWRA, by getting restaurant goers to donate money for UNICEF water projects.

Organizers say the paint is actually based on a chalk compound that will disappear by month's end.