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Yes, so, when you buy a toilet, you must buy one with a check valve so that the water in the toilet does not flow back into the pipe.
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It's usually the same tube.
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Yes, that's it, hehe.
Bathing is tap water, and the water for flushing the toilet is generally tap water or reclaimed water, which can only be said not necessarily, and the specific situation is analyzed on a case-by-case basis.
The water in the smart toilet will be connected to a water pipe from the angle valve, not necessarily from the tank.
The water of the water heater and the water used for the toilet bowl are a plumbing! However, the water in this pipe has a different flow direction, one flows into the water heater to heat up and becomes hot water, and the other flows into the toilet, so the toilet flushes down not hot water.
Yes, do you see that when you pay the water bill, is it marked? No, I don't.
Of course, the water at the source is the same, and it is dredged and diverted to various places through pipes.