Virtue Energy Water in lemon and lime flavour naturally contains zero sugar, zero calories, with no sweeteners. Each can contains about the same amount of natural caffeine as a cup of coffee (80mg). The energy comes from natural sources including yerba mate, guarana and ginseng. These drinks contain sparkling water, natural fruit flavours and nothing artificial. Virtue Energy Water in lemon and lime flavour naturally contains zero sugar, zero calories, with no sweeteners. Each can contains about the same amount of natural caffeine as a cup of coffee (80mg). The energy comes from natural sources including yerba mate, guarana and ginseng. These drinks contain sparkling water, natural fruit flavours and nothing artificial.