A hydrolat is the aromatic water produced during the distillation of plants (aquae distillatae ex plantis).

Hydrolats are obtained by distilling the various parts of aromatic plants with steam. They form during condensation and are separated from the essential oil (when present).

Conservation
Aromatic hydrolats are usually sold as sprays in glass bottles, but the Pranarôm laboratory recommends the use of a spray bomb that optimizes quality by using an airless system with no propellant. These systems prevent hydrolats from becoming contaminated and considerably extend their shelf life.