We bought a pump and took it to Bonneville for several years, never used it
Take a large storage bottle, and whatever size you plan to run plus a scale to make sure you are filling the amount you need. Leave the large bottle out in the sun for an hour before filling time, be sure to monitor pressure. Put the small one in the cooler, that will drop the pressure, hook em together and the high pressure of the big bottle will fill the little cold bottle, just be careful to monitor weight and don't fill too fast. Generally the little bottle will fully fill before it gets warm enough to match the big bottle pressure, if not, toss it in the cooler again.
The pump station took a compressor and 30 minutes to fill a ten, the hot cold method is easier and faster.
Good luck with the juice...