Ooh, nasty.Ulcerative Enteritus is the main disease quail are most susceptible to, as long as you have clean fresh water, they do fine.
Overcrowding, filthy water and feed contaminated with feces is the primary cause for the disease. UE can wipe an entire flock out in a matter of days.
I like the metal corner feeders for both feed and water for my quail. It keeps their dirty feet out.