اللّهُمَّ اسْقِ عِبادَكَ وَبَهـائِمَك، وَانْشُـرْ رَحْمَـتَكَ وَأَحْيِي بَلَـدَكَ المَيِّـت
Allaahum-masqi ibaadaka, wa bahaa imaka, wanshur rahmataka, wa ahyi baladakal-mayyita
O Allah, give water to Your slaves, and Your livestock, and spread Your mercy, and revive Your dead land.
Reference: Abu Dawud 1/305. Al-Albani graded it good in Sahih Abu Dawud 1/218.