The rat bait with Warfrin in it gets any meeces that feed on it.
After they get the effects they go looking for water. They may die inside but if there is water outside and they know it they will probably go out the way they came. Warfrin won't hurt us unless we have a heart condition or most other mammals. That is why I couldn't figure the EPA pulling Deacon or did they? In Uncles Orchards, in Indiana the Rats among other critters were a major problem. Deacon got them under control. He had to fill numerous holes under the foundation where the things came in.
Put it where kids and pets won't get it anyway and now water available to them in the RV.