haifagirl’s solution is the best.
All bugs instantly die from water with a little bit of soap. Roaches can be a bit more problematic though (they can survive being drowned for hours, being put in an oven, or a nuclear bomb).
But with ants and the like, a tiny little bit of soap in a lot of water instantly kills them all. And the best part is soap isn’t nearly as toxic to children and pets as real pest control stuff is.