Diatomeceous Earth works great.....until it gets wet.....and then not so much. Problem with that is that everything is always moist in my outdoor garden. I use it regularly, but I have to wait for a really calm morning when everything is still, because it carries on the slightest breeze. And I also don't water anything on the application day. The ants have to come in contact with it, but those really tiny ants don't seem to mind it very much. It's been very effective on everything else, though. And, yes, wear a mask!
Mix up equal parts Borax and powdered sugar and leave a few bottle caps of the mixture along the ant trail.....wait a few days for them to feed the queen....eventually the colony dies. But you'll have to monitor at all times, because they'll eventually rebuild their population.
For the immediate, here-and-now, you can apply some Captain Jack's Dead Bug spray (I use the concentrate and mix my own). No you don't have to worry about it condensing. It becomes inactive after a day or two.