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Fountain of Doubt
(midwest.social)
https://www.oglaf.com/fountain-of-doubt/
Alt text
Without doubt there can be no faith.
Title text
It tastes watery, but almost too watery.
If you didn't know, this one part of a series where these two characters try various magic fountains with different effects searching for the fountain of youth. It's a bit funnier in context because it's subverting the expectation of something weird happening when they drink the water.