Pressurized water tank or use suction water pumps

[Herbie]

Agreed. A basic Shurflo RV pump will give a decade+ of reliable service as long as you keep any grit or sand out of the impeller. (Fit one of Shurflo's strainer baskets between tank and pump.)

The big negative for me on a pressurized system is that it forces you into specific tank designs, and the necessary shapes (cylinders, spheres, etc.) waste a lot of volume vs. being able to just tuck a cuboid (or any other shape) polypropylene tank into whatever corner it'll fit into.