Fallout Shelter-all guys at 50% health. Why?

I just started playing Fallout Shelter on my iPhone. I'm hardly into the game and now, every time I log back in, every single guy in my vault is down to 50% health and the other half is filled with radiation. I can't possibly keep up with it. Even when I heal some of the guys, literally within minutes everyone is back to that state next time I log back in. Can someone help?

Your water level is too low.

Each of the three gauges has a vertical line running though it. If the total of whatever that guage is for dips below (to the right of) that line the gauge will turn red and you will start suffering a consequence.

Running out of electricity will shut down rooms, starting with the room furthest from your generator(s).
Running out of food will cause your dwellers to start slowly losing health.
Running out of water will cause the radiation problem you are seeing.

The game runs for a short period of time after you shut it down. You want to be at least halfway between the line and maximum before you shut down. You may need to build more resource rooms (one room, even a fully upgraded three-space one, can't supply more than a smallish base themselves.)

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