I recently tried this one and found it a bit sweet so diluted it a bit more and it's ok. What's yours?

Per 1 lite of water
Third of a cup of Fructose (lower GI than Glucose, but rather more expensive)
Quarter teaspoon salt
Big Splash of Robinson Barley Water (Strawberry I think)

Try half litre orange juice, half litre water, pinch of salt.

Does the job.

WCA had his sloe gin, worked in Swinley last Winter 😉

Ahh now a winter night-ride warmer needs to be hot Jagertee or hot whisky and orange – take a small flask – absolutely superb mid-ride tipple. It also heightens the fear of zombies.

1/3 – 2/3 apple juice to water plus 1/2 teaspoonful of table salt plus up to a couple of teaspoonfuls of the sugar of your choice in a litre

roughly isotonic erring on hypotonic side

Use Maltodextrin / fructose in something like a 3:1 ratio. Add suitable flavours…