Sports drinks. Maybe not 1/4, but 1/3-1/2 is certainly doable. The one in front of me is 150 calories per 28 oz, versus similar levels per 12-oz. serving for typical soft drinks.
At least in the UK many of the leading "sports" drinks, will add some form of artificial sweetener regardless of if it is a high sugar or low sugar variant e.g.
https://www.sainsburys.co.uk/gol-ui/product/lucozade-sport-o... - Sugar + Aspartame + Acesulfame K
https://www.sainsburys.co.uk/gol-ui/product/powerade-berry-t... Sugar + Aspartame + Acesulfame K
https://www.sainsburys.co.uk/gol-ui/product/lucozade-sport-z... Acesulfame K + Sucralose