Originally Posted by
Jetpig32
I hate to break it to you all, but there is one potable water tank on the 320's and 737NG's. This tank feeds all toilets, sinks, and coffee makers. I don't think any mainline aircraft have the older re-circulation "blue juice" toilets.
On the 320's, the indication panel is in the front galley. 737's its in the rear. Yes, it would be a FA's pre-flight check. That said, it is unlikely this went overlooked. When the water/waste system is serviced before each flight, the contractor calls it in to operations. If they do not enter this into the computer, it locks the flight crew from receiving a final weights manifest. (a stop gap measure for this not happening)
More then likely, the inoperative water was due to a maintenance issue, and the FA's kept it simple.
found this courtesy of Aeroflot. gives you an idea of the airbus.
http://lms.aeroflot.ru/data/U0FT1M0/...0&%20WASTE.pdf
I used to service water and lavs on 320s and 737s (among others), and we definitely filled both the potable water and blue juice using two separate trucks and two separate service panels. (Though yes, the toilets used a splash of potable water to clean the bowl.) We didn't call anything in or enter anything into the weight and balance, not every plane was serviced, and it never kept flights from receiving their manifests. As I recall, there was a standard placeholder figure that was used, similar to how they use an "typical" passenger and baggage weight rather than weighing everyone.
My experience is over 10 years ago though, so maybe things have changed?