I would say get chickens but if you have freezer space crack eggs mix till all yellow strain and pour into ice cube trays freeze then put egg cubes in freezer container 4 eggs is about 6 cubes.
Mineral oil works but eggs need to have un damaged shells and works best with clean but not chemically pour us commercial egg shell. The store stuff the natural coating has been removed. Also use dip method if you don’t easy to miss some shell causing rotting. If one went bad no big deal you can use rest just crack in a bowl each one before use so if bad it does not wreck all the eggs.