Dua - At meal time when visiting someone

Prophet (SAW)'s Prayers
At meal times when visiting someone
Recite:
اللَّهُمَّ أَطْعِمْ مَنْ أَطْعَمَنِي وَاسْقِ مَنْ سَقَانِي
"O Allah, feed him for he has fed me and quench his thirst for he has
quenched my thirst".
(Muslim)
Alternate dua
أَكَلَ طَعَامَكُمُ الْأَبْرَارُ وَصَلَّتْ عَلَيْكُمُ الْمَلَائِكَةَ
وَأَفْطَرَ عِنْدَكُمُ الصَّائِمُونَ
"(May) the righteous partake of your food andthe angels of mercy
descend upon you and those who are fasting break their fast with you.
(Hisnul Hasin)
Also recite the above dua which praises Allah and thanks Him.