UGGG....I feel your pain!! I started hatching quail last April, and it has been a complete nightmare at times. I have had to learn through trial and lots of error what I have done wrong and how to fix it. I have figured out that they do better with medicated feed when they are very young. The feed store told us it was safe for a couple of weeks, and without it, they just die. We would go out in the mornings and one or two more would be dead.
I also found out REAL quick, that they will RUN to water, and drowned themselves in minutes like you said. I use marbles, and lots of them. They have to search for a wet spot in my waterer!!!!
As far as the mishaps go, quail are so fragile, it doesn't take a whole lot to kill one. I'm a bit embarrassed to say this.....but.....yesterday, I was moving a batch of quail out of the incubator to the brooder, and I squashed one flat. I felt sooooo bad, but the little things are like cockroaches!!!
Good luck, and don't give up. I love my grown quail. They make the prettiest sounds late in the afternoon, and are fun to watch!!!