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.
Crush a couple of grapes between your fingers and taste the juice. If you have purchased a hydrometer, use it to measure the grapes' sugar content. It should be between 22 and 24 brix, which means that the alcohol content of the wine will be approximately 11 percent.