Is a single Basmala sufficient when consuming food and drink at the same time, or is it obligatory to say the Basmala for each item separately?

Saying "Bismillah" (In the name of Allah) is prescribed at the beginning of every significant act. If a Muslim consumes various types of food and drink at once, one recitation of "Bismillah" suffices. However, it is better to say "Bismillah" when partaking of each type, as the Prophet, peace and blessings be upon him, used to say "Bismillah" at the beginning of each drink and praise Allah at its end. He would interrupt his drinking to breathe outside the vessel three times, then drink and praise Allah.