Water, Unflavored (Beverage) Status: Recommended The following common additives to water do not pose a kashrus concern: caffeine, calcium chloride, calcium citrate, flouride, hydrogen, magnesium chloride, magnesium oxide, magnesium sulfate, potassium bicarbonate, potassium carbonate, potassium chloride, potassium hydroxide, sodium bicarbonate, sodium chloride. If the water contains flavor or an additive not listed above, please contact cRc Kosher with details, and someone will be able to help you.