Dua after drinking water

اَلْحَمْدُ لِلّٰهِ الَّذِىْ سَقَانَا عَذْباً فُرَاتاً بِرَحْمَتِهِ وَلَمْ يَجْعَلْهُ مِلْحاً اُجَاجاً بِذُنُوْبِنَا

All praise is due to Allah, Who of his mercy has granted us sweet and pleasant water to drink and did not make it bitter and salty due to our sins.     

Reference: 

  • Beautiful Sunnats