How Much Water Do You Need for Overlanding?

Photo By: Anthony Sicola

A lot of people will argue that the most important thing to take with you on an overland journey is a GPS, a well-stocked first-aid kit, or even an inexhaustible supply of bourbon. But the most important thing you’ll ever take with you into the backcountry isn’t a mobile device or another type of shiny new gadget you can bolt to your rig. Its water.

Knowing the exact amount of water to bring on a trip isn’t always easy — especially if you’re new to overlanding. I’ve been exploring the backcountry by vehicle for more than two decades. In that time, I’ve adopted a pretty good system for exactly how much water to bring for my journeys, as well as tools to make toting large quantities of water on the trail easier.

Water is Life

80 Series Land Cruiser on the trail in Washington State.
My 80 Series Land Cruiser with my preferred method of water storage. Photo by Anthony Sicola

Humans and animals can go without food for about three weeks but would only last around three to four days without water. On average, and in perfect conditions, the typical person drinks about two liters of water per day, though that can change dramatically with the amount of exercise you get or the relative outdoor temperature. Obviously, you’ll drink more water the hotter it gets or as you increase your activity level.

The general rule for overland travel is one gallon of water per person per day. This includes water for drinking, cooking, cleaning, and personal hygiene. So, for a single person, a three-day trip into the backcountry requires a minimum of three gallons of water.

And, no, beer and whiskey don’t count toward your water requirement — as much as you’d like them to. Alcohol dehydrates, so you will actually require more water each day.

Read More: Filter Your Water on the Go with the Travel Berkey

Where Do You Store All of This Water?

First, let’s talk about the weight of water. Water is heavy. One U.S. liquid gallon of fresh water weighs roughly 8.34 pounds or 3.785 kilograms at room temperature. Given that measurement, we can extrapolate that a full 20-liter/ five-gallon jerry can (that weighs 4.3-pounds empty) plus 44.3-pounds of water is around 48.6-pounds total. It is easy to see that carrying a lot of water with you can get pretty heavy, although not carrying water with you is a recipe for disaster. So, you be the judge.

Storage can be as simple as a Scepter Jerry Can, Rotopax, or a larger water tank like Front Runner Outfitters Slanted Water Tank. We’ll take a look at these options below:

Scepter Jerry Can

Product image of the Scepter Jerry Can
Scepter Jerry Can. Photo by Scepter

The Scepter Jerry Can is built to military specs and used widely around the world by the military and NATO. This five-gallon food-grade, low-density polyethylene (LDPE) and high-density polyethylene (HDPE) construction cans are BPA-free and will not add taste, odor, or any chemicals to the water. The Scepter Jerry Can features a single carrying handle and a screw-top cap that locks securely in the closed position. The small spout makes it easy to fill water bottles, and the breather hole with its own cap provides great airflow for easy pouring. I’ve used two of these mounted on a rack on my Land Cruiser for ten + years, and they haven’t let me down yet.

MSRP: $72.95


RotoPAX Water Cans

Product image of the RotoPAX Water Can
RotoPAX Water Can. Photo by RotoPAX

RotoPAX Water Cans are a popular choice for overland travel as they are durable, lightweight, and don’t leak. These two-gallon roto-molded water cans have thicker walls and stronger construction to make them leak-proof – along with a sure seal gasket to guarantee your spout won’t leak or vibrate loose. RotoPAX mounting kits are sold separately, but this solution provides a lot of options for placement in or on your vehicle.

 MSRP: $74.95

 Front Runner Outfitters Slanted Water Tank

Product image of the Front Runner Outfitters Slanted Water Tank
Front Runner Outfitters Slanted Water Tank. Photo by Front Runner Outfitters

If you’re looking for a semi-permanent water tank, it is hard to pass up the Front Runner Outfitters Slanted Water Tank. This tank holds 50 liters or 13.2 gallons of water and includes two channels for mounting straps to make sure the tank stays where you want it. This tank is made from BPA-free polyethylene and includes plastic fittings that allow you to connect a hose for easy access. The slanted design fits perfectly behind the back seats in most SUVs.

MSRP: $229.00

Dometic Go Water Hydration Jug

Product image of the Dometic Go Water Hydration Jug
Dometic Go Water Hydration Jug. Photo by Dometic.

Dometic’s Hydration Water Jug 11 l lets you easily store and pour the water you need. Keep it in your vehicle or at your campsite for a convenient, safe water supply of 11 liters of fresh water for your campsite. There are multiple dispensing options built in, including two openings for easy filling and cleaning. Pair it with the Dometic Go Hydration Water Faucet for powered dispensing of your water.

MSRP: $69.99

Read More: Gear Essentials: Water Storage, Showers, and Sanitation

What if you don’t want to carry water with you?

If you’re already pushing gross vehicle weight, you might not want to carry a bunch of heavy water with you. In this case, you should have a way to treat water while you’re out on the trail. 

Let me be clear that I don’t recommend this option unless you are absolutely certain that you have access to a water source nearby. When I’m traveling, I can never count on being near a water source at any given time, but you may have a different experience than me.

The options below are typically used in conjunction with the products I outlined above, so you have a treatment and a storage solution.

MSR Guardian Gravity Water Purifier

Product image of the MSR Guardian Gravity Water Purifier
MSR Guardian Gravity Water Purifier. Photo by MSR.

The MSR Guardian Gravity Water Purifier is a 10-Liter soft-sided water reservoir that is easy to fill and removes bacteria, sediment, viruses, and protozoa through gravity action. The Guardian Gravity Water Purifier features a quick-release valve with easy shutoff. It’s great for filtering water in camp while you handle other chores.

MSRP: $299.95

Katadyn BeFree 1L Tactical Microfilter

Katadyn BeFree 1L Tactical Microfilter
Katadyn BeFree 1L Tactical Microfilter. Photo by Katadyn

Katadyn’s BeFree 1L Tactical Microfilter is small enough to take on nearly any adventure and weighs in at just 2.6 ounces, so your bag weight stays low. Incredibly stowable, this water filter is quick to deploy. Simply unscrew the lid, fill it up, and the hollow fiber filter filters out bacteria, cysts, and sediment. I just wish I had one of these when I rode through India in 2007, but that’s a story for another time.

MSRP: $59.95


Lifesaver Jerry Can

Product image of the Lifesaver Jerry Can 20000UF
Lifesaver Jerrycan 20000UF. Photo by Lifesaver

The Lifesaver Jerrycan 20000UF is a great hybrid treatment/ storage solution. Its carbon filter removes viruses, bacteria, cysts, parasites, chlorine, taste, and odor out of 20,000 liters worth of water. The Jerrycan itself can hold 18.5 liters of water. The replaceable filter exceeds NSF P248 compliance standards, and the container is BPA- and BPS-free.

MSRP: $319.95

Whichever route you end up going, the most important thing to remember is that your solution needs to be easy to use. Knowing before you leave for your trip that you have clean water – or at least access to water that you can treat – is vitally important. Thinking about these things before you go is much better than winging it and not having enough water.

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