Unfortunately neither colour nor turbidity are strong indicators of the overall chemical composition of water. However both colour and turbidity reduce the amount of light penetrating the water and can have significant impact on algae and macrophytes.
Wines range from 0 to about 220 grams per liter sugar, depending on the style. Dry wines can contain up to about 10 grams of sugar per bottle but still taste dry. Bone Dry <1 cal per glass. Dry 0-6 cal per glass.
Sugar is what the wine yeast ferments to make alcohol. When the fermentation is done the sugar is gone. When there is not enough sugar for the yeast, there will not be enough alcohol in the wine. Certainly in the case of wild grapes sugar will be in short supply and marginally so with some native wine grapes.