Two basic options for plumbing water to your machine:
Hookup to your domestic water system:
https://www.chriscoffee.com/products/water-softening-and-filtration-system
Hookup to bottled water:
https://www.chriscoffee.com/products/flojet-demand-pump
I've got my unit's plumbing disassembled and in a citric acid bath. Although it was dirty as sin, I only found one line completely plugged.
The boiler and element had a smaller amount of scale, not too bad. Into the bath also.