Answer

In Jain practice, especially regarding careful food and water discipline:

Ek kal nu paani means water that is used within one kāl.

Here, kāl means a fixed time-period used for deciding how long water may be kept and consumed after it has been properly prepared, usually after boiling and cooling.

Explanation

In simple terms:

• Paani = water
• Ek = one
• Kāl = a time duration

So ek kal nu paani means “water valid for one kāl.”

In Jain household practice, boiled water is not generally kept indefinitely. It is consumed only within the permitted time limit because Jain Dharma emphasizes jīv-dayā — compassion toward living beings — including very subtle life forms in water.

The exact practical duration of “one kāl” may be followed differently according to family tradition, sect, local custom, and guidance from monks or nuns. Therefore, for strict practice, one should follow the maryādā taught by one’s own guru-paramparā.

What is “kāl” in water?

Kāl here does not mean “black” or impurity. It means time period.

It is a religious time measure used to determine whether the water is still acceptable for drinking according to Jain discipline.

Spiritual Understanding

The purpose of this practice is not merely health or hygiene. Its deeper purpose is:

• to reduce harm to water-bodied living beings,
• to live with awareness,
• to practice restraint in daily life,
• and to cultivate ahimsā even in small actions.

Takeaway

Ek kal nu paani means water kept only for one permitted time-period. In this phrase, kāl means time duration, not color or dirt. For exact timing, follow the guidance of your Jain tradition or guru.