Well i might be mistaking here, but i was always told by older folks to use rain water to water your garden and plants. The reason being that theres a bunch of chemicals like chlorine in tap water, especially in town water.
And as for the snow, i was always told not to eat it, yellow or not, so i've never used it. I'm sure theres not much difference in snow water than in rain water considering it's comming from the same place... Maybe the cold air in winter time kills off some of the bacteria in the air, or changes the acidity of it, i dont know i'm not much on the scientific side of things.
Now i'm wondering about well water... Thats what i use for my washes. I'm no scientist, but im sure well water might have some minerals in it, since its comming from underground, that could maybe help your ferment in comparison to rain water which is basically distilled water. (even though it most probably catches acid, chemicals, bugs and birdshit on the way down.)
![Laughing :lol:](./images/smilies/icon_lol.gif)