Nirjala Ekadasi is one of the most popular and toughest Ekadashi. The Nirjala Ekadashi is also known as Pandav Bhim Ekadasi fast. The main difference between other Ekadasis and Nirjala is that devotees do not drink a single drop of water on that day. Staunch Vishnu devotees who undertake this fast do not drink water while fasting and also refrain from consuming any food on that day. The fast begins on Ekadasi sunrise and ends the next day.