Chant the mantras of Lord Indra with gratitude for rain, water, food, and the balance of nature. Keep your prayers humble, because without humility, power becomes unbalanced.
Simple Salutation Mantra
Om Indraya Namah
For daily remembrance and simple worship of Lord Indra
11 or 21 times
Vajrapaani Mantra
Om Vajrapaanaye Indraya Swaha
For destruction of enemies, freedom from fear, and gaining strength
108 times
Rain Blessing Mantra
Om Hreem Indraya Varsham Dehi Dehi Swaha
For seeking rainfall, relief from drought, and agricultural prosperity
51 or 108 times
Devendra Gayatri Mantra
Om Sahasranetraya Vidmahe Vajrahastaya Dheemahi Tanno Indrah Prachodayat
For wisdom, prosperity, leadership strength, and divine blessings
21 or 108 times
Surapati Stuti Mantra
Om Aim Hreem Shreem Indraya Devarajaya Phat Swaha
For royal comforts, attaining high position, prosperity, and success in all works
51 or 108 times
Guidance
Mantra chanting should also inspire water conservation, humility in leadership, and gratitude toward nature.

