Differ slightly different additives

In a supermarket, there is a vitamin drink with lime , lychee several flavors , Calcium lactate and above " vitamin drinks " and " water-soluble vitamins " word is particularly prominent , " lychee flavor ", " lime flavor " and " peach flavors " prominently marked . This beverage has the same recipe several flavors : pure water , sugar, food flavor, food additive ( different tastes slightly different from its additives ) , vitamin C , etc., but it is strange that , regardless of any one flavor , are not the corresponding fruit composition .
While another nutrient drink fruity lemon flavor , in the list of ingredients marked with water, sugar , buffered lactic acid ( citric acid ) , food flavor , calcium lactate , magnesium , taurine, potassium gluconate , zinc gluconate , nicotinamide , etc., but I could not find lemon fruit ingredient labeling .