Suppose I am descending the Matterhorn along the Hörnli ridge, and night falls when I am near the Solvay emergency hut (4003 m; safe bivouac is several hours of descent away). In this case, I believe I should not try descending further, but spend the night there.
I'll need drinking water in this case, but I am not sure where I can get some snow to melt. Can I expect to find snow anywhere along the Hörnli route? What should I do if I find myself running low on water, while starting to descend from the summit?
I am talking about high season here (August).