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That's exactly what I was talking about. Here's a pump I've seen people use:Just for completeness--There exists yet another variant:
Systems exist that use non-pressurizing pumps like the one described by @orton, except that instead of having to manually turn on the pump when needed, there is an electrical switch at each faucet that automatically turns on the pump when any valve is opened. The advantage of this is that a plumbing leak does not flood your rig the way a "pressurized" system can.
I don't think this system is very popular these days. I do know that it was used by the Airstream Interstate back in 2004.

Amazon.com: 12V Portable Submersible Water Pump | Top Quality Small Elegant Pump Made in Germany by Comet |For Campervan, RV, Boat, Outdoor, Travelling, Well, Aquarium, Gardening Use : Patio, Lawn & Garden
Amazon.com: 12V Portable Submersible Water Pump | Top Quality Small Elegant Pump Made in Germany by Comet |For Campervan, RV, Boat, Outdoor, Travelling, Well, Aquarium, Gardening Use : Patio, Lawn & Garden
www.amazon.com
And a faucet:

12V Electric Water Faucet Tap with Switch | Ideal for Kitchen Sink and as Pump Connection in RV, Trailer, Campervan or Boat (Up to 1.5 BAR) | Rotatable spout Perfect for Laundry, Outdoor, bar (Black) - - Amazon.com
12V Electric Water Faucet Tap with Switch | Ideal for Kitchen Sink and as Pump Connection in RV, Trailer, Campervan or Boat (Up to 1.5 BAR) | Rotatable spout Perfect for Laundry, Outdoor, bar (Black) - - Amazon.com
www.amazon.com
Just submerge the pump in a jerrycan and you have a water system.