اللَّهُمَّ أَطْعِمْ مَنْ أَطْعَمَنِي ، وَاسْقِ مَنْ سَقَانِي
Translation 
"O Allah, feed him who fed me, and provide drink to him who provided me with drink."
Note:
This Dua can be also said after having a meal at someone's house as a guest, or as an encouragement for someone to offer you food.
Note:
This Dua can be also said after having a meal at someone's house as a guest, or as an encouragement for someone to offer you food.
Transliteration
allaahumma aṭ‛im man aṭ‛amanee, wasqi man saqaanee
Sources:
Muslim No# 2055
