Princes Gate Water is helping to raise 1.2 million for the Children's Hospital for Wales, by stocking promotional packs in Asda stores throughout the country.
The money raised from the packs will go towards vital equipment for a new critical care unit, which looks after babies and children needing high dependency or intensive care.
Packs are available in stores throughout Wales now.
General store manager at Asda's new store on Leckwith Road, Cardiff, Tony Humphries, commented: "I know I speak on behalf of everyone at Asda when I say how proud we are to be supporting both The Noah's Ark Appeal and Princes Gate Spring Water. Community is always at the heart of everything we do here at Asda so to be able to support a local business and a charity that does so much for Wales' children is a true pleasure."
Princes Gate is donating 12p from every 99p six pack of water sold.
Noah's Ark Appeal director, Suzanne Mainwaring, commented: "The Noah's Ark Appeal is thrilled to have the support of top Welsh brand, Prince's Gate Spring Water, as our champion working together with Asda to raise vital funds and awareness on our behalf.
"Money raised from this promotion will help us to fund a children's 'open' MRI scanner - we'll be one of the first children's hospitals in Europe to have one!"