I’m not sure what you mean by “aavas” in Jain practice. In Jainism, common terms for fasting or vrata are upvas, upavasa, or vrata (austerities), and rules about water depend on which vrata you’re observing. Some strict fasts (like nirjala) prohibit both food and water, while other fasts allow water but restrict solid foods, and the exact timing (e.g., not drinking water after noon) can vary by tradition (Digambar vs. Śvetāmbara) and by the guru or community.

If you can share the exact term you’re using (e.g., upvas, nirjala upvas, or the name of the vrata you’re following) or the context (which Jain tradition you follow, and which day you’re observing), I can give you a precise explanation grounded in Jain sources.

In the meantime, here is a general Jain framing you can compare with your practice:

• Many upvas rules permit water but restrict food, and some days have more stringent rules.
• Nirjala upvas is the most stringent and typically forbids water as well as food.
• The timings for breaking a fast and when drinking water is allowed can differ between Digambar and Śvetāmbara communities and between teachers.

If you’d like, I can look up a precise Jain source on the specific vrata you have in mind and summarize the authoritative interpretation for both major traditions.