Well we have ants. They like our cat's food and they enter our house through our front door in neatly organized single file lines until they access salty cat kibble. We tried putting the food in a dish of water but we discovered that in fact, ants can walk on water...sort of. Apparently what they're actually doing is taking tiny ferry's made of cat food particles across the mote to the mother load. Also, in case you're wondering, ants can support almost 100x times their own weight, they move an estimated 50 tons of soil per year in one square mile, they have two stomachs - one for themselves and one to hold food for others, and when an ant finds a food source they leave a trail of pheromones to inform their fellow soldiers to follow the lead.
So now that I've personalized them and discussed their strengths as any vegetarian might, I looked up ways to naturally deal with the ant catastrophe. Here's what worked:
A spray bottle with water and either fresh lemon juice or lemon essential oil, ground cinnamon or cinnamon oil, and peppermint oil. As a bonus it smells fabulous so you can lift your spirits while murdering tiny four-legged families. It's not going to be an Ant A-bomb like raid, it's more like a border than a killer, but at least it won't give you Parkinson's. Every day we spray the boundary of our door and it creates a blockade of lemony bliss. Try it.