Pipe It Out
Plastic piping that is safe for water supplies is your best bet for a water line. You'll need to attach it to your receptacle before letting the water run into the box, and bury the piping below your frost line. This will keep it from freezing in the winter. Once the line has reached your demand point, pipe it out to address your needs. If it's a potable and isolated spring that you trust 100 percent, you may consider using it for a home water source. If your water source is at all questionable, it should be filtered before consumption. And as for pressure, if your spring box is 44 feet above your faucet, the water pressure at your faucet will be roughly 20 psi (pounds per square inch), which is definitely lower than you'd be used to using—most municipal supplies and independent homes operate on standard pressure of about 35 psi. To get this from gravity alone, the source would have to be 75 feet above your outlet. If your source is higher, it can actually create too much pressure, blowing out seals and gaskets at your point of demand. For that case, you could add another vented concrete box to the system around 75 feet above the demand. This will relieve the excess pressure, and give you water at a workable PSI. Mechanical pressure reducer valves for gravity fed water systems can also do this job.