Ruling 642 — Purification (Ṭahārah)

If someone deems it probable that there is water in his travel luggage, or in his house, or with the group of people he is travelling with, he must search for water in those places until he becomes confident that there is no water or he loses hope in finding some, except if previously in a particular situation there was no water and now he deems it probable that water will be found, in which case it is not necessary for him to search.