In Jainism, the practice of drinking boiled water is common, especially among monks, nuns, and lay followers who observe higher levels of discipline. This is done to minimize the harm to microorganisms (known as nigodas) present in raw or untreated water, in accordance with the principle of Ahimsa (non-violence).

Boiling water kills many microorganisms, thus reducing the number of living beings that might be consumed unintentionally. After boiling, the water is typically filtered through a clean, fine cloth (pichhi or cheesecloth) before drinking.

Jain monks and nuns are particularly strict in this practice, and even householders observing vrats (vows) may follow this during certain periods, like Paryushan. The boiled and filtered water should ideally be consumed within a limited time (often within 6-12 hours) to avoid new life forms developing in it.

So, yes, in Jainism, drinking boiled (and filtered) water is encouraged as an act of non-violence and care for all living beings.