((اللَّهُمَّ أَطْعِمْ مَنْ أَطْعَمَنِي، وَاسْقِ مَنْ سَقَانِي)).
Transliteration
(Allahumma atAAim man atAAamanee wasqi man saqanee.)
Translation
(O Allah, feed him who fed me, and provide with drink him who provided me with drink.)
Source
Hisnul Muslim (Fortress of the Muslim), No. 183 — chapter “Invocation for someone who gives you drink or offers it to you”. hisnmuslim.com
Related Duas
Invocations before eating
Supplication 1 of 2
((إِذَا أَكَلَ أَحَدُكُمْ طَعَاماً فَلْيَقُلْ بِسْمِ اللَّهِ، فَإِنْ نَسِيَ فِي أَوَّلِهِ فَلْيَقُلْ بسمِ اللَّهِ فِي أَوَّلِهِ وَآخِرِهِ)).
(When you are about to eat, you should say:(Bismil-lah.)and if you forget to say it before starting, then you should say (when you remember):In the name of Allah in it’s beginning and end.)
Hisnul Muslim · No. 178
Invocations after eating
Supplication 1 of 2
((الْحَمْدُ لِلَّهِ الَّذِي أَطْعَمَنِي هَذَا، وَرَزَقَنِيهِ، مِنْ غَيْرِ حَوْلٍ مِنِّي وَلاَ قُوَّةٍ)).
(All praise is for Allah who fed me this and provided it for me without any might nor power from myself.)
Hisnul Muslim · No. 180
((اللَّهُمَّ بَارِكْ لَهُمْ فِيمَا رَزَقْتَهُم، وَاغْفِرْ لَهُمْ وَارْحَمْهُمْ)).
(O Allah, bless for them, that which You have provided them, forgive them and have mercy upon them.)
Hisnul Muslim · No. 182