Pretty sure Bladerunner used a plain old steel gas 'bottle'. Same kind as the ones that hold butane for campers but bigger (usualy propane for industrial heaters and whatnot)...
Most drums hold chemicals/oils/spirits,ect, not water. Water (or other inerts) is usualy stored in PVC is'nt it?. Likewise most corrosives are stored in plastic/PVC barrels...
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