Intention for fasting
Wa bisawmi ghadinn nawaiytu min shahri Ramadan
"I intend to keep the fast for tomorrow in the month of Ramadan"
Iftar Du'a
Allahumma laka sumtu wa'ala riz-qika-aftartu
"O Allah! For You I have fasted and with Your provision I have broken my fast"
(Sunan Abu Dawud: 2358 - Book 14, Hadith 46)