Thanks for asking. In Digambar Jain practice, the exact food items permitted on a fast day like Anant Chaturdashi (During Byasana) can vary by tradition and guru. The common principles are:

• Do not eat after sunset or during the night in many Digambar practices (fasting or partial fasting may be observed).
• Avoid root vegetables (like potatoes, onions, garlic, carrots) as well as greens in many strict observances.
• Fruits, dairy products, nuts and seeds, and certain non-grain legumes are commonly allowed, while grains are often restricted or avoided on strict vrat days.
• Sweets and prepared items should be made from permitted ingredients and without grains in many traditions.

A practical, commonly accepted list you might consider (but please confirm with your local guru as customs can differ):

• Fresh fruits (any varieties)
• Dried fruits and nuts (almonds, cashews, pistachios, raisins, dates)
• Dairy products (milk, yogurt, paneer/curd, ghee) if your practice allows dairy
• Legumes and pulses that your tradition permits (many simple vrat days allow moong dal or other lentils in limited amounts; some Digambar lines avoid lentils on strict fast days)
• Sweeteners and non-grain sweets (jaggery, sugar, sesame-seed based sweets) made without grains
• Coconuts and sesame seeds (til)
• Plain, easily digestible foods in small quantities if your vrata prescribes a small meal

Important: these are general guidelines and can differ between Digambar sub-traditions and individual sadhus. To give you a precise, official list for tomorrow, I can look up a specific Digambar protocol from a trusted Jain source. If you’d like, tell me and I’ll verify with an authoritative Jain reference and share the exact items your tradition prescribes.