Answer

No. After doing Chauvihar, one should not drink water until the chosen time is completed, usually until the next morning after sunrise or as per the vow taken.

Explanation

In Jain practice:

• Navkarsi means no food or water until 48 minutes after sunrise.
• Porsi means no food or water for one prahar after sunrise.
• Chauvihar means avoiding all four types of intake: food, water, mouth-fresheners, and any edible/drinkable substances.

So once you have taken Chauvihar, drinking water would break the vow.

Spiritual Understanding

Chauvihar is practiced to reduce harm to living beings, especially subtle organisms, and to develop self-control, discipline, and awareness. It is considered a spiritually beneficial form of restraint in Jain Dharma.

Takeaway

After Chauvihar, do not drink water unless there is a serious health need. In such a case, health should be handled carefully and respectfully, and future vows can be adjusted according to capacity.