According to the Co-op website, 3p of every litre of Co-op branded bottled water sold funds One Foundation projects.  In January 2017 the Co-op Group said that 70% of the money raised by the One Foundation had comes from sales of its Fairbourne Springs water. It had donated £7 million over a 10 year partnership helping 1.5 million people.

Reference:

Co-op Group celebrates 10 years supporting One Foundation water projects in Africa (17 January 2017