Invocation for someone who gives you drink or offers it to you

1. اللَّهُمَّ أَطْعِمْ مَنْ أَطْعَمَنِي وَاسْقِ مَنْ سَقَانِي

   (O Allah, feed him who fed me, and provide with drink him who provided me with drink.)

Fortress of the Muslim (Hisn al-Muslim), Sa'id al-Qahtani.