I had the fire department fill my pool after I had it 1/4 of the way full out of the garden hose (to let the liner get settled). I live in the city limits and have a hydrant in the corner of my property so it was filled with city water completely. I made a $50 donation to them and they were happy to do it for me (volunteer fire department). They say they pay a set rate for water whether they use 10 gallons or 100,000 gallons, so they don't mind doing swimming pools around here. I know your situation is a little different, but if you follow the advice of this web site and poolsoutions.com you will have your water in perfect shape in no time. If you are going to completely fill out of a fire truck I would have them fill the first 1/4 of it slowly so the liner will settle properly and then fill it up faster after that. After I got mine to that point it only took 45 minutes out of the hydrant and I was swimming right after. I would definately check into the fire department option for sure!!

Good Luck!!