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It must be tap water, and there is a float valve switch in it, which automatically closes the water inlet valve when it is full. Can be opened.
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What's in the toilet tank? It's not something that holds water.
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Buy a bottle of oxalic acid, dilute it with water, pour a little on it, and then brush vigorously with a brush.
Toilet cleaner will do. It is sold in major supermarkets and shopping malls.
Toilet cleaner, toilet cleaner, toilet brightener, etc., all brands have good results.
Go to a chemical store and buy a diluted hydrochloric acid wash, but it's best to wash it twice.