Navkarshi pachkan (a vrata observed after morning prayers) is treated differently in different Jain traditions and by different teachers. In many practices, when one takes this vrat in the morning, drinking water is restricted for the rest of the day and is not done after sunset until the next morning. However, the exact rule can vary between Digambar and Śvetāmbara communities and even by region or guru.

Because the timings and allowances can differ, the safest approach is:

• follow the guidance given by your local guru or the tradition you personally follow
• if you want, I can look up the precise interpretation from JainKnowledge sources for your specific tradition and provide a clear, dated reference

If you’d like, tell me which tradition (Digambar or Śvetāmbara) you follow or the guru/temple you consult, and I can give a more definite answer with sources from JainKnowledge.