Nirjala Ekadashi is also called Pandava Bhima Ekadashi, or Pandava Nirjala Ekadashi. This name is derived from Bhima, the second and most grounded of the five Pandava, legends of the Hindu Veda Mahabharata. The Brahma Vaivarta Purana portrays the story behind the Nirjala Ekadashi vrata promise.
Bhima needed to observe all Ekadashi fasts couldn't control his craving. He drew closer the sage Vyasa, creator of the Mahabharata and grand dad of the Pandavas for an answer. The sage exhorted him to follow Nirjala Ekadashi, when for one day in the year; he ought to observe a fast. Bhima achieved the righteousness of every one of the 24 Ekadashi, by watching Nirjala Ekadashi. While on different Ekadashi forbearance of sustenance is seen, on Nirjala Ekadashi, a flat out fast seen, without sharing even water.
The water-less fast is considered to be a great degree hard to take after as the day falls in the hot Indian summer and therefore, it is esteemed as extremely dedicated sombreness. The fast is watched 24 hours from dawn on Nirjala Ekadashi to dawn the following day.
Some watch it from dawn to nightfall. On the day preceding Nirjala Ekadashi, the devotee performs the night supplication to God and takes one and only dinner, without rice - as rice eating is denied. The enthusiast is however allowed to have a solitary minor drop of water as a component of the Achamana cleaning custom. Water more than that equivalent breaking the pledge. May 29th is the occurrence of Nirjala Ekadashi in the year 2015.