A few months back I had a pipe burst in my basement and the water had to be shut off for a day until a plumber could come. It was a strange experience not being able to flush toilets, take a shower, brush my teeth, etc.
Seconded. About a year ago the piping was being replaced in the entire building, so the water was off. Even though we knew in advance so I'd filled a few bottles and we had prepared some "flush-buckets", it's still a strange experience to open a faucet and
nothing comes out.
For short term though, I think a day without water like that is easier than a day without electricity. A while ago some idiot drilled through a power line and we were partially without power for about 11 hours (hallway and shared facility (toilets, kitchen)
lights still worked, but rooms didn't) and that't much more annoying. Without electricity, you can't work, you can't keep any food in the fridge, and at night you can't even read a book because there's no light. With water being gone for a short while, there's
usually a replacement available, while few of us have an emergence backup generator at hand.
For longer term though, I think water would become a big problem faster than electricity.