Here are some articles and FAQs from the LLLI website about relactation or inducing a milk supply. You may find it helpful to read them before posting.
I would like to resume breastfeeding after an interruption. How do I relactate?
Back to the Breast
How does breastfeeding save lives and prevent illnesses during an emergency? Part 1
Emergency Breastfeeding Resources
Breastfeeding in Emergency and Relief Situations:
refugee camps, war, famine, earthquakes and other natural disasters
How to Find a La Leche League Leader Near You
Can I Breastfeed My Adopted Baby?
Adoptive Breastfeeding Beyond Infancy