Mikva in Nature: Source of Water

Spring water, whether moving or stationary, is a kosher mikva.
Rain water is only a kosher mikva once it is stationary (just sitting in a pool, not flowing anywhere).
In neither case may the water enter a constructed mikva through a "kli," which includes being carried in a bucket or via pipes with bends and other places for water to collect. In the case of a pipe that may not be a kli,  consult a rabbi.
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I just read this halacha, Mikva in Nature: Source of Water, at www.practicalhalacha.com. I think you will find it very interesting.