Every survivalist should consider some kind of portable water solution. Whether this is 5 gallon buckets, 7 gallon drums or like in this video, 16 gallon drums.
The drum in this video will hold 16 gallons of water, but I only put 15 gallons in it. This is to leave a little head room. These drums originally held some kind of Dr. Pepper syrup. But its nothing that some soap and water will not wash out.
When the drums were bought and brought home, dish washing soap was squirted into the drum, a water hose was inserted into the mouth and the water hose turned on. The water was allowed to circulate through the drum for 10 – 15 minutes. Then the drum was turned over, drained, stood back up and the water hose reinserted.