Comment: As neat as that water tank is, it's not a great use of $500

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As neat as that water tank is, it's not a great use of $500

And a 5000 lb tank would strain any floor and most ground.
For that money you could 20 lifestraws and still take up less room. I'd spend half on storable foods and the other half on a commodity, whether it's silver or tobacco or hershey bars.