Musgrave SuperValu-Centra has signed a £2m contract with local firm Rocwell Natural Mineral Water to supply its 700 stores in Northern Ireland and the Republic.
The deal means that the 120 SuperValu and Centra stores in Northern Ireland will be stocking Rocwell products.
Rocwell, located in Pomeroy and Dublin, was founded in 1989 and now boasts a staff of 45.
The company supplies still and sparkling natural mineral water to a wide range of clients, including airlines, banks, hospitals and Government buildings throughout Ireland.
Sharliene Loughran, sales manager at Rocwell said: "The MSVC own label contract has been a major boost to our business and will give us countrywide distribution of our product."