Simple math based on the protein ratios suggests that the product is 75% water and 25% milk. Such a dilution would drop the sugar content to 3g which explains why they add sugar to get up to 8g. I suppose that the gellan gum is added as a thickener so the mixture seems more like milk than water. It would be simpler and likely cheaper just to dilute regular skim milk with water and chew a calcium tablet!