Why do drinks made with no dairy or sugar or anything (like unsweet tea or black coffee – just water and leaves/beans) sour or mold over time?

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I’d think the factors that cause mold would be stuff like sugars, dairy, sweeteners in drinks. Water doesn’t really do that alone, so why does water + leaves mold?

This question has been bothering me and I’m finally asking because it’s driving me crazy.

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