Answer

In Tivihar Ekasana, you should not drink water at night, because Tivihar means giving up three types of food intake after sunset:

• Food
• Water
• Other drinks/liquids

So, if you drink water at night, it would not remain Tivihar.

If You Have Cough Problem

If your cough is troubling you and you genuinely need water for health, then you may take water for medical need, but you should understand that the vow of Tivihar is then broken or reduced.

In such a case, it is better to:

• Take guidance from your Guru Maharaj / Guru Bhagwant if available.
• Do the tapas according to your health capacity.
• If needed, take a lighter vow instead of forcing Tivihar.

Spiritual Understanding

In Jain Dharma, tapas should be done with shraddha, awareness, and discipline, but not with carelessness toward serious health needs. If health does not permit strict Tivihar, one can do the vow according to capacity and with honesty.

Takeaway

If you drink water at night, it is not Tivihar. But if your cough requires water, prioritize health and consult your Guru. Do the tapas with sincerity, not force.