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How We Store & Transfer Extra Water To Our RV When Camping

Why We Need Extra Water When Boondocking

We boondock most of the time which means freshwater is a big deal to us.

We have to cook every meal in our travel trailer and need enough water to be able to do dishes, shower, and do laundry when camping without any hookups.

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The fresh water tank in our travel trailer holds around 45 gallons. Our grey and black tank combined will hold 70 gallons of wastewater.

Because we have so much extra holding tank space we carry an extra 35 gallons in the bed of our truck using these square 7 gallon water jugs (click to view on Amazon) by Reliance.

See Also: Best RV Water Hose For Drinking Water

The 7 gallon water jugs in the bed of our truck.
4 Reliance water jugs fit perfectly in a standard truck bed.

We chose to use jugs like these over a water bag because we like to be able to carry the extra water with us at all times.

They fit perfectly under our truck bed cover and we can use them to get water at filtered water dispensers like the ones found outside grocery stores and gas stations if we can’t find a hydrant with potable water anywhere else.

(This happens a lot in places like Arizona where free or affordable freshwater can be difficult to find)

With the extra water, we are able to boondock comfortably for about 10 days at a time. We make coffee and cook with the water in our fresh tank so, in the end, everything fits in the black and grey tanks.

Also if we ever need a little bit more water for whatever reason it’s just a quick trip to a freshwater source to get that bit of extra water we may need.

How We Get The Water From The Jugs To The RV

Lots of people use jugs like we do to get extra water but the question people always ask us is how we get the water into the fresh water tank without a ton of work or losing a bunch of water.

Our solution is to use an RV water pump and some hose that’s ok for potable water.

The Water Pump

The reason RV water pumps are perfect for pumping water from jugs to a tank is they are diaphragm pumps.

Diaphragm pumps can pump both air and water without getting damaged, which is nice since you will end up getting quite a bit of air in the line when the jug starts to get low and when you transfer the hose from one jug to another.

Most RV water pumps are 12 volt pumps like this one (click to view on Amazon).

People who use the 12 volt RV water pumps will hook them up directly to their trailer or truck batteries using alligator clips like these (click to view on Amazon).

This is great if you don’t have a generator with an outlet, a solar set-up, or a portable solar power station. It’s also a good water pump to have just in case the one in your RV goes out.

You can use the 12-volt water pump to replace it because it’s the same kind of pump.

The AC Amarine Made RV water pump.
The AC Amarine Made RV water pump that we use to pump water from the jugs to the RV fresh water tank.

I chose to go with the Amarine Made AC RV Water Pump (click to view on Amazon.

The only difference between my RV water pump and a 12 volt one is mine has a regular plug you can use in a standard wall outlet like the ones found in a home, which means you don’t need to get anything extra to get the pump running so long as you have a powered outlet.

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I normally use our Jackery 500 Power Station (click to view on Amazon) or our Maxoak 500 (click to view on Amazon).

They both have an outlet I can just plug the pump directly into. When we are low on power I can also just plug the pump into our inverter generator.

Using a power station with an RV water pump.
Using a power station with an RV water pump.

One great thing about having a power station is most of them have a 12V DC power source as well as an AC one so if you have a 12V water pump you could attach a 12V plug like this one (click to view on Amazon) and power it with a solar power station.

We’ve been using our Amarine Made AC RV water pump for over a year now on a regular basis and it has worked perfectly.

I mounted it to a board with a piece of rubber mat in between so it has something to sit on when it’s running and so far it’s been quiet and pumps water quickly, even through a 50-foot hose, which I’ll talk about next.

The Hoses

Originally, I purchased 6 feet of 1/2 inch clear braided PVC tubing (click to view on Amazon) that I cut in half and connected to the two barb adapters that came with the RV water pump.

On the water intake tubing end, I put a 3/4 inch PVC end cap (click to view on Amazon) on using a 1/2 inch barb adapter (click to view on Amazon) and drilled holes in it to keep it from vacuuming to the bottom of the jug.

The outtake end I left open and I put that end into the fresh water tank when I have the jugs near the trailer.

PVC cap on the intake end of the 1/2 inch PVC tubing.
PVC cap on the intake end of the 1/2 inch PVC tubing.

Most of the time for the outtake end I connect our 50 foot zero g hose (click to view on Amazon) so I can pump the water from the jugs in our truck bed and I don’t have to carry them all the way to the travel trailer.

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This system is much nicer and takes a lot less work.

Even when pumping through 50 feet of hose the small RV pump delivers a decent amount of flow.
Even when pumping through 50 feet of hose the small RV pump delivers a decent amount of flow.

The pump came with 4 adapters. Two were the kind you can push tubing onto and the other two are 1/4 inch threaded.

You will need to make an adapter to turn the 1/4 inch male to a male hose.

I did this with a 1/2 inch to 1/4 inch reducer (click to view on Amazon), a 1/2 inch coupling (click to view on Amazon), and a 1/2 inch to 3/4 inch garden hose male adapter (click to view on Amazon).

It’s not pretty and you are putting a PVC fitting into a brass one but it does the job. Just make sure you use lots of plumbers tape.

See Also: 10 Ways To Make Your RV Fresh Water Tank Last Longer


Everything fits nicely in a small tub I got from the local dollar store. All I did was drill holes in the lid so the pump can breathe and dry properly.


The entire process only takes around 30 minutes. That’s with setting up and putting everything away. The pump is surprisingly fast and the 35 gallons of water get transferred quickly.

Bringing extra freshwater with you camping can make everything a little more comfortable and it’s especially worth it if you want to spend more than a week at a campsite.

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To balance the water in our grey and black tanks we will do things like save our shower and dishwater and dump it down the toilet and into the black tank.

This helps keep the black tank fluid and it makes dumping the trailer much faster.

If you have any questions about transferring extra freshwater to your RV leave a comment below.

by Jenni
Jenni grew up in a small town in Idaho. With a family that loves camping, she has been towing trailers since a very young age.

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