Moat: The idea is sound and eco-friendly but for me, this was a complete non-starter. I live in Brazil and we have a problem with mosquitoes. Any standing water is best to be avoided so a moat was out of the question. The other issue I had with it, is evaporation, I don't want to be refilling a small bowl of water several times a day. So whether it was a large or small amount of water, for my situation neither was ideal.