Is there such a thing as water ants?

My wife thinks so because we have an ant problem yet our kitchen is spotless. My wife is an obsessive cleaner; nary a negligible Tom Thumb of a crumb is left on the kitchen counter or floor. The ants seem to be attracted to wet dishes just taken out of the washer. They also hang out in the sink and I've seen them in the bath tub. I personally think they're just retarded or desperate ants. I've never heard of ants that can subsist on water.