Oma water is a very special, famous and easy to prepare Ayurvedic medicine.
benefits: 
Oma water is used in the treatment of indigestion, dyspepsia, low digestion power.
It has a cleansing effect over the urniary bladder.
It calms Vata and Kapha.
dosage: 
5- 10 ml.
In children, it is given in the dose of 5 – 10 drops. once or twice a day after food.
Reference: Arkaprakasha.