I like the "old school" approach. You just can't kill those old belt-driven reciprocating
diaphragm pumps. Just have spare belts available.
That said, most of the "fancy" new potable
water pumps are very rebuildable. Mine has lasted three years so far. Before that, I went on line and found a number of places that
sold parts to
repair the old one, but it was at the age where I figured a total replacement was worth it.
In the end I also bought a spare pump. Potable
water is something I'd like to have back on-line quickly, and it was cheaper to buy the whole pump than all the possible spare
parts I might need.