You can also get a pretty good start on selecting the water by first drawing a selection around the water areas (see sample below) then use the Color range (Highlights) to select the whites of the water inside your selection. Copy the resulting selection to a new lay then mask the new layer and adjust the selection further. (For example, you will have picked up the highlight on the guy to the left's forehead so you can mask that out.)
Picking up individual droplets of water might really be hard in any case. This could well be a candidate for "reverse engineering" i.e. making a selection of everything that is NOT water then inverting that.
As for what I did in my first post. Just ran the smart sharpen filter in
PSCS2 to reduce the paper texture.