Answer

For doing parna after upvas, it is generally recommended to use warm or hot water, not cold water.

Explanation

In Jain practice, after fasting, the body and digestion are considered delicate. Warm water is usually preferred because it is gentler and easier on the stomach.

Cold water is generally avoided immediately after upvas because it may disturb digestion and is not the usual traditional practice for parna.

Takeaway

If possible, do parna with warm/hot water. If you follow a specific Jain tradition, gacch, or family practice, it is best to follow your guru’s or elder’s guidance.