Long Range Fuel Tanks & Water Tanks.

Touring, remote traveling and long distance traveling all require a vehicle capable of long range. Fuel and water are needed to keep the vehicle and the occupants going.

Best way to increase distance is to carry more. The more the vehicle can carry the less fuel is need to be purchased a high country fuel prices.

Fuel:

The main fuel tank can be replaced with bigger long range fuel tanks.

Sizes vary from make and model. Most factory stock tanks are around 55-75 liters aftermarket long range tanks can vary anywhere from 100-150+ liters.
Keep in mind the bigger the capacity more weight is gained and in order to gain that capacity the long range tank will more than likely be deeper, possibly hanging lower than the previous stock fuel tank, which means less clearance to the ground.

Extra Fuel Tanks:

These come as factory options on Toyota Land Cruisers and Nissan Patrols.
As aftermarket options there are auxiliary long range fuel tanks available. On 4 wheel drive Ute they can tuck up between the chassis and the spare wheel or can completely replace the spare.

Water Tanks:

Come in many different shapes and forms, simple jerry cans 5-25l are very effective and cheap for water storage, if exposed to the sun it would be best to get a non-transparent jerry cans, unless of course the plastic is UV resistant. You don't want the sun to spoil the water.

Water bladders are excellent if space is a problem, they can mold around bumps and bends. One could even be placed over the drive shaft arch behind the front seats.

Water tanks that are mountable to the vehicle:

When hooking up hoses to a mounted water tank, make sure the tap at the end is lower than the water tank itself, this way gravity will do the job. It can be mounted higher but this would require a water pump for it to function.