Pādodaka (Sanskrit: पादोदक, lit. foot-water) is holy water. Its prepared from bathing the Linga or guru's feet. It is one of the Ashtavarana or the 'eight protections' of Lingayatism.
This holy water is used in many sacred occasions to call upon good fortune and celestial blessing. It is sprinkled across while entering into a new house, on the newly bought vehicle etc.
References
Pādodaka Wikipedia(Text) CC BY-SA