I did a quick search on this. The world record is 18 days, and even that isn't a proper record without water:

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>Andreas Mihavecz, an 18-year-old Austrian man, may have survived the longest without drinking water: Police accidentally left him in a holding cell for 18 days in 1979. It's a fuzzy record, though, since he allegedly licked condensation off the walls of the prison.

https://www.sciencealert.com/here-s-the-longest-people-have-survived-without-air-food-water-sunshine-or-sleep

So he got some moisture licking the walls during that 18 day period, so even that was not completely without water.

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It is probably just false that this pastor went without water for 25 days.

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One must be an idiot to attempt to go 40 days without food or water. Food, that is possible (though not a good idea), but not water.