The Prophet's (SAW) habit was to break his fast with dates, if dates were not available he would have dried dates, and if dried dates were also not available, he would break his fast with water.
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دلائل:
مشکاۃ المصابیح: (621/1، ط: المكتب الإسلامي)
وعن أنس قال: كان النبي صلى الله عليه وسلم يفطر قبل أن يصلي على رطبات فإن لم تكن فتميرات فإنلم تكن تميرات حسى حسوات من ماء. رواه الترمذي وأبو داود.
Allah the Almighty knows best.
Darul ifta Al-Ikhlas, Karachi.