Answer

In Jain Dharma, Tivihar generally means taking a vow to avoid three types of intake after the set time: food, water, and certain consumables, while allowing only specified exceptions depending on the vow and tradition.

If someone has taken proper Tivihar after sunset, then he should generally not drink water after sunset. Saying Navkar Mantra before drinking water does not make it Tivihar-compliant.

Explanation

There is sometimes confusion because different households may follow different practical customs, such as:

• Chauvihar: no food or water after the set time.
• Tivihar: usually no food, but water may be allowed only up to a certain declared time depending on the specific vow being observed.
• Duvihar: more limited restriction than Tivihar.

So the key point is: the exact Pachchakkhan wording matters.

If the person’s Pachchakkhan is specifically taken as: “I will not eat, but I may drink boiled water until 10 pm,” then that is a different form of vow or allowance, not the strict meaning of not taking water after the vow time.

But if he has taken Tivihar from sunset, then drinking water after sunset would generally break that vow.

About Saying Navkar Before Drinking Water

Reciting Navkar Mantra is always spiritually beneficial, but it does not change the rule of the vow.

Navkar Mantra is for reverence, purification of thoughts, and remembrance of the Panch Parmesthi. It should not be used as a way to override Pachchakkhan discipline.

Takeaway

The safest Jain understanding is:

• If he has taken Tivihar from sunset, he should not drink water after sunset.
• If he has taken a vow allowing boiled water until 10 pm, then that depends on the exact Pachchakkhan and tradition.
• Reciting Navkar does not cancel or modify the vow.

For certainty, he should ask the person who gave him the Pachchakkhan or a knowledgeable Jain sadhu/sadhvi or scholar from his tradition.