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.
The amount of alcohol in wine has more influence on calorie count than carbs, since alcohol has seven calories per gram, while carbs (i.e. sugars) have four. So a lower-alcohol wine has fewer calories than higher-alcohol wines, independent of the amount of sugar. 2. Buy European.