We keep a bottle of water in the bathroom for drinks, but everyone brushes teeth with the tap water, and both Sophia and Kathleen may or may not have had a drink of bath water from time to time. Edwin goes for it every bath. I don't get to worried, however - we call it inoculation.
In addition to not drinking water from the tap, we also have to deal with a lesser-known hazard of third world water supplies: water pressure. Most denizens of Cairo live in high-rise apartments. The government isn't in the business of supplying water pressure, just the water itself. And so most apartment buildings have cisterns on top that are filled with the building water pump.
The problem with individual building pumps is that they can easily be shut off for some reason that is only known to... somebody. We still haven't figured out who it is. And when somebody decides to shut off the pump, they don't tell anyone else. They also don't tell when they're going to turn it on again either.
I've had several morning showers where I've noticed a decrease in pressure and had to jump double quick to get the shower in before the water was shut off completely. One notable morning, I noticed the water slowing, got in and got my hair damp before having to take the shower head off the wall and just settle for scrubbing off the morning run sweat and taking another shower later. While getting dressed, I noticed that the tap was running somewhat promisingly and so got back in the shower and crouched in the tub while getting my hair mostly washed and mostly clean.
To water the plants that day, I just left the tap on over a bucket and let the bucket fill as it wanted to, with the water shutting on and off at random. I have a friend who keeps large jugs of water in all of her bathrooms to flush toilets when the water's being fidgety.
In addition to building water outages, there are also periodic and completely random neighborhood outages. I've heard that they're announced over the loudspeaker at Friday prayers, but there aren't any mosques nearby and I'd be surprised if even the Egyptians understood anything coming from them.
And so, you never know quite when you will and won't have water. Every now and then, however, circumstances line up just right and the water's out during dinner preparation time. So I have no choice but to just order in. Life is hard sometimes.