In the future:
#1 Use your on board tanks when the temps get down below freezing, disconnect and drain your supply hose. (Those frost proof faucets drain the water out of them when they are shut off, leaving them on will cause them to freeze. )
#2 Open your cupboard doors, most plumbing is next to the walls and it is the coldest.
#3 Before turning in at night, shut pump off and open faucets to allow for expansion in case you do have frozen pipes.
#4 FORGET ABOUT running water, a lead pencil size flow is nearly 1000 GALLONS PER DAY. Only if the campground host tells you to run water should you. Can you imagine what 50 campers @ 1000gal per day will do to the water system, bill and sewer system.
We have camped in temps down to zero and used the above cautions and never had a problem. We also live in a climate with temps to minus 30 or greater for days at a time and learn to prepare ourselves for cold weather.