Choose a water containment vessel that meets your water needs. An IBC tote makes a good stationary water tank. A 55-gallon food-grade barrel makes a good portable water tank. When purchasing used water tanks, question the seller regarding the previous contents of the tanks to ensure the water will be safe for drinking and or garden and farm use. Anytime the previous contents are questionable, use for non-potable water uses only.
The water vessel needs an opening at the top of the tank that can be opened to allow airflow when the pump is in use. A sealed tank will implode. This can be as simple as opening the lid on the top.
Install a shut-off valve on your water tank if it does not already have one.
Building a Portable Water Tank Using a 55- Gallon Barrel
Using a 55-gallon portable tank (see warning above regarding used water tanks). Cut a hole large enough to fit a 90-degree PVC elbow joint that is threaded on one side only. Recommend 3/4 " fittings. You will want to place the bottom of the non-threaded end of the elbow joint as close to the bottom of the barrel as possible. Allow enough space for the water to flow easily but also to utilize as much water as possible in the tank. 1/8" to 1/4" is probably sufficient for most jobs.
Use a 3/4" male water spigot on the outside of the tank. Using silicone and Teflon tape to seal the gap, connect the elbow placed at the bottom of the tank to the spigot. Use channel locks to tighten. This task is easier to complete with a helper holding the fitting in the tank in place with a crescent wrench while it is tightened from the outside. Allow to dry before use.
Secure tank in a trailer, or back of off-road vehicle with straps and fill with water. Be extremely cautious when driving with a water tank in the back of an off-road vehicle! The movement of the water and sheer weight of the water (440 pounds of water) will make you less stable.
Using the Off-Grid Water Pump
Open the air valve at the top of the tank prior to the operating the pump.
Open shut off valve on the water tank.
Connect the pump to a 12-volt marine battery. Connect the negative alligator clip (black) to the negative connector on the battery first. Connect the alligator clip of the positive cable (red) to the positive connector on the battery last. The pump should begin running once hooked up.
Use water as needed
To turn off the water pump, disconnect the positive (red) alligator clip from the positive connector on the battery first, and then disconnect the negative (black) alligator clip from the negative connector. (An optional switch can be installed if you prefer not to mess with the battery connections.)
Close the water shut-off valve.