Answer

If you have taken Beyashna and later want to drink water in the evening, you should take Pachkhan for water only, commonly expressed as:

“Pani nu Pachkhan” — allowing yourself to drink water within the proper time limit.

Explanation

In Jain practice, Beyashna means eating only twice in the day, within the rules of the vow. After completing food, if you still need to drink water later, you should clearly keep permission for water in your Pachkhan.

Usually, one may say in simple form:

“Hu pani mate Pachkhan lau chhu.”
“I take Pachkhan permitting water.”

However, the exact wording can vary by tradition, sect, and local practice.

Important Note

Please ask your Guru Maharaj Saheb / Sadhviji / local knowledgeable elder for the exact Pachkhan wording followed in your sampraday, because Pachkhan should be taken correctly and respectfully.

Takeaway

After Beyashna, if you wish to drink water in the evening, keep water permission separately in Pachkhan, and follow your tradition’s exact wording and time limits.