Like Art said, if it’s plastic tubing like Pex there will be repair couplings available, but you will not be able generally to repair it yourself unless you also rent a special crimping tool, there are mainly 2 types of these according to which kind of Pex you have, one kind uses a metal ring over the fittings that the tool crimps down on. These can be obtained usually for rent in any Lowe’s or HD, along with the couplings.