Commonly found variants; note these may range from acceptable alternatives to non-standard forms or incorrect spellings*.
* Singlish is a largely spoken creole, and as such descriptivism (recording forms that reflect actual pronunciation in spoken language, or as appearing in the linguistic corpus) is more pertinent than strict prescriptivism. Nevertheless, the use of more standard forms (or for words originating in languages with Latin script, such as Malay, accurate to the original spelling) is recommended and encouraged.

also can:

outside food and drink

outside food and drinks

English:

outside

+

food

+

drinks

expand for details Detailed etymology

definitions

noun

  1. food and/or beverages consumed in an establishment from which they were not purchased, which are usually disallowed and frowned upon in most Singaporean restaurants, eateries, bars, etc.
  2. When she asked the staff if she could wash the grapes on their premises, they promptly pointed to a sign that read: "No outside food and drinks are allowed."

    — 2007 April 5, Liang Dingzi. Today, "THE FAMILY WAY TO GOOD SERVICE". p.31


usage notes

'Drinks' is usually only expressed in the plural; 'outside food and drink' is rare.