Zesta

Zesta is a soft drink that appears in GTA 6.

It can be seen in the conclusion of Trailer 1, as Lucia Caminos and Jason Duval kick in the front doors to Uncle Jack's Liquor.

Zesta has been shown to come in at least two flavours, as packs of bottles can be seen wrapped in orange and green shrink wrap.

The name Zesta is likely inspired by 'zest,' which indicates that citrus fruits flavor the drinks. 

It's possible that the brand's name is inspired by the real American soft drink company Shasta; however, its logo isn't similar to the real drinks company's.