I know a lot of you will jump down my throat, but we use a concentrated ant spray that we mix up to the desired strength. Most of us have our food in air tight containers. The wife cleans out the cupboards every few months and sprays the in side of the cupboards, waits about an hour and puts it all back. When we mop the floor we also spray around the edges of the walls and floor. We also spray around the outside of the van as well. Also take the vents off the back of the fridge and spray in there as well. Haven't had a problem with ants in the five years we have been on the road.

cheers

Darryl & Josie