As part of the tie-up, United Wholesale Scotland will distribute more than 100,000 vouchers to 500 primary and secondary schools in Scotland so pupils can collect a free bottle of Highland Spring from their local Day-Today.
United Wholesale Scotland has 212 Day-Today stores in central Scotland and has invited all schools within a half mile radius of each store to participate in the project.
"We hope it inspires children to consider being healthier and drinking plenty of water," said MD Asim Sarwar. "At the same time we hope it will help build awareness of the Day-Today brand."
Water consumption levels in Scotland were among the lowest in the developed world, added Highland Spring group sales director Simon Oldham.