Hi Russel, you are very welcome to the forums.
With rain water in less quantity and with Dew you can make good quantity of Niter, which should to be somewhere pink in color, as the Patrick Reviere was doing in his works, it is called by the Philosophers the name of "Gur", which is the very first form of prima materia, its planetary charge corresponds to Mars, which is the same Spirit as dwells in us, that's why many peoples think that it has some very healing virtues but they lead astray exactly like the Patrick Reviere who also think that it is a marvelous medicine, but the matter of truth is, that it contains a very least amount of the Spirit so it cannot be used as a good medicine, that's why it can only be produce during a practicing work, to perceive Nature that how she is spreading and cultivating its seeds through this Gur which descends from the most upper spheres and comes down to earth by the help of this carrier (Niter) enclosed in the drops of Water and results for creating of everything on Earth.
Regards.