This is not the only method for pressurize rainwater. However this system works great for off grid, low tech, low cost, temporary, and even partially portable applications.
Pump - 12v, 2.9 GPM, 50 psi. flojet brand (you can get one that runs on ac too)
Filter - Reusable whole house spin down sediment filter, 50 micron
![](https://s2.save4k.ru/pic/nnvXMZVwy_Y/maxresdefault.jpg)