On my motorhome all water lines running from one side to the other run between the black and grey tanks. Not sure of the number of connections on the top of the black tank, but should be the toilet, sink, and the shower.
Don't rule out condensation either.
In the summer, for 2 months, I go to a campground near my son's. They have a water well and pump system. Every time I'm there one of my connections under the kitchen sink drips off and on. Nothing serious but a pain. The other 10 months I'm not there and I have no problems. I don't change anything in my water hookup. I figure the campground pump has pressure issues.
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