Having had a water pump fail, and being very lucky to have been near an RV dealer where I could buy a replacement relatively easily, I now carry a spare pump along with a small assortment of hoses and clamps. Cheap insurance.
2009 Tacoma Crew Cab, TRD 4WD
2007 Tundra Double Cab TRD 4WD
2014 Escape 19
2007 Norwegian Elkhound "Baxter"