Assalamu alaikum, It is not part of the sunnah to gargle. One must swirl the water around in his mouth.

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Wa alaikum salaam, If it flew when flushing the toilet, this might be pure from the water container and it might be impure. Therefore, if you are not sure, the default is that it is pure.

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Wa alaikum salaam, all these thoughts are a bit “too much” and you must control your thoughts each time shaytan whispers them to you by seeking refuge in Allah! Otherwise it might turn into an OCD. You don’t know for sure that urine has been transferred to the rim. Therefore, you should ignore this doubt.

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