Ignore all the improvised recommendations Billi. You will either be at risk of hurting yourself, causing harm to non-target species or wasting your time. Use a registered pesticide, one that is approved by the APVMA. A good place to start looking is the Pubcris website
https://portal.apvma.gov.au/pubcris You can search the site for chemicals that are effective against all manner of pests including ants. Searching for ants will bring up hundreds of recommendations. Have a look at some of the product labels and find one that matches your situation.