The extended listing, worth £260,000 to the end of this year, comes after the brand performed well in the supermarket chain last year.
It will see Asda stock seven still and sparkling water Macb varieties in a range of packs, including four new flavours.
Lynsey Graham, regional development manager for Macb, said: "The demand for locally sourced, natural and sugar-free products is at an all-time high, and with the Macb brand going from strength to strength we felt it was the perfect time to extend the range of refreshing flavours available in both still and sparkling water.
"The four new flavours prove that sugar-free drinks don't have to taste bland or boring and we're confident they will be well received by customers looking to add a bit of flavour to their day."
Macb became part of Cott Beverages when the firm, a division of Canadian giant Cott Corporation, bought soft drinks firm Sangs out of administration in 2012.
The company employs 50 staff at its Aberdeenshire site, where a range of sugar-free spring waters are produced.
Asda's Lisa Prudhoe said supporting local suppliers was part of Asda's Scottish strategy.