I can share a simple, traditional understanding, but keep in mind that Digambar practices can vary by sangh (monastic group) and region. If you want exact liturgy texts and a step-by-step ritual, a local Digambar guru or a trusted Jain resource should be consulted.

What nirjala vrata (Digambar) is, in brief

• Nirjala vrata means a day-long fast with no water or food from a chosen starting time (often from sunrise) until the next sunrise or sunset, depending on the local practice.
• It is considered a strict form of upavasa (fast) and is usually undertaken for spiritual purification, self-control, and to discipline the senses.
• The aim is to cultivate detachment from ordinary needs and to increase bhakti (devotion) and contemplation of the Tirthankaras.

Opening the fast (how it is commonly approached)

• After the prescribed period of abstention ends, the devotee typically performs a short prayer or ritual to thank the Tirthankaras, the teachers, and the community.
• The break-fast is usually done gradually: first a small amount of water, then a light, easily digestible fruit or simple food, and finally the regular meal after a short interval. The exact sequence and fasting-break rules can differ by community.
• Many Digambar practitioners begin with prayers for gratitude and self-purification, followed by a modest, simple meal rather than a full feast.

Important notes

• The specific mantras, procedures, and order of rites for opening a nirjala vrata vary between Digambar traditions and local temples. If you want the precise rite sequence and authentic wording, please check with your local Digambar sangh or a recognized Jain authority.
• If you’d like, I can help you find a Digambar-specific guidance page from a Jain center or JainKnowledge.com that matches your question.

Would you like me to look up an exact Digambar nirjala vrata opening procedure from a reliable Jain source and share a concise, tradition-accurate summary?