Fasting: Unintentionally Swallowing Something Other Than Water or Water from the Nose
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 1658
If a person puts something other than water in his mouth and unintentionally swallows it, or if he puts water in his nose and unintentionally swallows it, then qaḍāʾ is not obligatory for him.