In Jainism, tapasya (austerity) means self-discipline and inner purification to free the soul from bondage. An 18-day tapasya is a short, structured period of intensified practice rather than a fixed scriptural rite. You can tailor it to your status (Śrāvaka/Śrāvika layperson or monk/nun) and tradition (Śvetāmbara or Digambara), but the spirit remains the same: more restraint, more mindful conduct, and more spiritual study.

A simple 18-day layperson tapasya plan (example)

• Daily practices (every day)

- Observe ahimsa (non-violence) in thoughts, speech, and action. - Speak truth with care; avoid harm through words. - Practice Brahmacharya (monogamy/sexual restraint for laypeople) or reduce sensual indulgence. - Eat with minimal violence: avoid root vegetables if possible and limit processed food; eat modestly. - Do a short samayika (meditation for the soul) for 24 minutes (or your local time equivalent) each day. - Read or listen to Jain teachings, especially about the Tirthankaras and right conduct. - Perform at least one act of charity or service.

• Extra practices for certain days

- Fast or partial fast on specific days (upvas) as your health allows; e.g., one light fasting day in a week, or two days of abstaining from grains, dairy, and sweets if suitable. - Observe strict satya (truth) and abstain from deceit or unkind speech on chosen days. - Spend time reflecting on punya (merit) and pap (demerit) of actions; aim to reduce intentional harm.

• End with reflection

- On day 18, review what changed in thoughts, speech, and conduct; plan how to continue the improved steady practice.

Notes and variations

• Digambar vs. Śvetāmbara: the core aims—ahimsa, satya, aparigraha, brahmacharya—are shared. Specific fasting rules, devotional practices, or ritual details may differ. If you follow a local guru or center, align the 18-day plan with their guidance.
• For households: incorporate family and work life; the emphasis is gradual purification, not hardship for its own sake.
• For the truly committed (monastic) path, the discipline is more stringent and governed by monastic rules; 18 days as a layperson can be a practical practice to cultivate disciplined living.

If you want, tell me your current practice level (layperson or monastic), your tradition (Śvetāmbara or Digambara), and any health considerations. I can tailor an 18-day plan that fits you exactly.