Water from unbaked clay filters feels fresh due to evaporative cooling [0]. Some of the water seeps through the walls and slowly evaporates, cooling the recipie

Water from unbaked clay filters feels fresh due to evaporative cooling [0]. Some of the water seeps through the walls and slowly evaporates, cooling the recipient. The magnitude of this effect depends on air humidity. This is the same principle behind a Botijo [1]. I don't know where in the country you're from, but here the water and sanitation department said the water is okay to drink from the tap. Very few if any people do it anyway, as everyone is used to filtered water. Maybe water quality wasn't as good in the past, or as reliable (it still isn't). [0] https://en.wikipedia.org/wiki/Evaporative_cooler https://en.wikipedia.org/wiki/Evaporative_cooler [1] https://en.wikipedia.org/wiki/Botijo https://en.wikipedia.org/wiki/Botijo