Use elimination method..

...

Food - Needed.

Fuel - Needed

Electricity - Needed.

Medicine - Needed.

Education/Academics - Optional (most people can run school, college or university if people want).

Sports/Entertainment - Needed (otherwise boredom will kill people,😀.

Law and Order - Needed (but laws have to be clear)

Internet - Needed (main source of information).

etc.. etc.. and most people can provide those services.