Floral Water / Hydrosols that are Certified Organic must not contain preservatives because no preservatives have been approved for use in aromatic hydrosols worldwide.
Most commercial Floral Hydrosols contain preservatives, palm glycerin, acetone (yes, the same stuff in your nail polish remover) and alcohol (even in small amount and you can't smell it). There are also expensive Floral Hydrosols and Face Mist advertised for skin care but made up of entirely water with a little essential oil added to it along with a dispersal agent such as clay, talc or magnesium, then coloured or filtered with chemical solvent for clarity. Artificial fragrances are often in order to create an aroma similar to the essential oil from the same flower or plant.
It is terribly important to be vigilant and read labels carefully. Always look out for the Latin botanical name, country of origin and presence or absence of preservatives and foreign additives.