Human saliva is pure in itself. A Muslim and non-Muslim, a person with or without wudu, a junub person and a menstruating woman do not have impure saliva merely because of their legal state.
If blood or another actual impurity in the mouth transfers immediately into the water, the ruling concerns that contamination—not the act of drinking.
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Su’r: Categories, Purity, and Juristic Differences
Human saliva is pure in itself. A Muslim and non-Muslim, a person with or without wudu, a junub person and a menstruating woman do not have impure saliva merely because of their legal state.
If blood or another actual impurity in the mouth transfers immediately into the water, the ruling concerns that contamination—not the act of drinking.