Du'a on breaking the fast

ذَهَبَ الظَّمَأُ، وَابْتَلَّتِ الْعُرُوقُ، وَثَبَتَ الْأَجْرُ إِنْ شَاءَ اللَّهُ

Dhahaba al-ẓamaʾu wa-btallati al-ʿurūqu wa thabata al-ajru in shāʾa Allāh

The thirst is gone, the veins are moistened, and the reward is confirmed, if Allah wills.

Sunan Abī Dāwūd 2357: Ḥasan (Al-Albānī)