This is a perfect summer cooler. Jal Jeera, or jaljira, is an Indian beverage. In Hindi, "Jal" means water and "Jeera" means cumin. Jaljira powder generally consists of cumin, ginger, black pepper, mint, black salt, some fruit powder (usually either mango, or some kind of citrus zest), and chili or hot pepper powder.
Jaljeera has a very long history, originating on the banks of the Ganges river At one time, the powder was ground on stone slabs, and stored in clay pots. It is still a common drink at Indian cultural events. http://en.wikipedia.org/wiki/Jal-jeera
The cumin is a medicinal ingredient which aids digestion. The mint has a cooling effect. Black salt or rock salt acts as a digestive. It is sometimes served as an appetizer, as it is intended to “startle” the taste buds
Jaljeera is popular in northern India because it is thought to have cooling properties, against the temperature of the region. It is generally served with appetizers before a meal, but is also drunk between meals. Some versions do not involve any added sugar.