Lightly sweetened grapefruit soda with real juice. 100% natural. Not too sweet. 90 calories per bottle. GuS is grown-up soda. GuS Star Ruby Grapefruit is a dry, refreshing soft drink made from the prized grapefruit variety. The Star Ruby is known for its bright red, tart-sweet juice. Contains 5% juice. No caffeine; no preservatives; gluten-free; pasteurized. www.drinkgus.com.