Hi Helen, here's some recipes! https://pesthacks.com/homemade-ant-killer/
Ants don't like the smell of peppermint and won't cross over or walk thru salt, baby powder or baking powder.
Hi Helen - Those little buggers are relentless, aren't they?!? This is the most effective method and all-natural spray DIY that we use with ants. It's best indoors, but will also work outside with more frequent applications. Hope this helps! Hugs, Holly