When it comes to purchasing food, there are numerous phrases that can be used as synonyms for the phrase, "buy food". "Acquire groceries" is a common phrase used to indicate the act of buying food for one's household. "Purchase provisions" may be used to refer to the act of purchasing food for a special occasion such as a feast or party. "Procure sustenance" is a phrase often used by those who value a minimalist lifestyle. "Obtain nourishment" is another phrase that can be used to refer to the process of buying food. Regardless of which phrase you choose, the message is the same; it is time to stock up on sustenance.