Toilets are what Brits call the room that America's call a bathroom. I guess at least that has the virtue of the room actually having toilets in it and not baths.
I'm a Brit (as my handle suggests) and technically I agree with your comment but if I read you can't drink "the water in the toilets" it sounds pretty literal even to me.
Another lifelong American checking in with "bathroom". I've lived up and down the East coast, and "bathroom" would have been normal to hear anywhere, alongside "restroom". "Washroom" would be a very distant 3rd option.