Many just use a hose from a bib on the side of the house and a garden hose to fill the pool. Or, you can buy water and have it trucked in. It may be cheaper and faster to truck in, as you usually pay your sewer based on water usage.
Once the pool is full, you can use a garden hose to top off the pool when necessary.
The builder may include an autofill, in which case a single 1/2" feed line will suffice.
There really is no need to plumb water lines to the equipment pad.
If you are in the process of getting quotes, if you post your plans/quotes/equipment list, you will get great feedback on your proposed build.