It's not practical to store potable water as an investment and if you were able to do so, your government would probably seize it if there was a real water crisis. An easier way to invest in Water is to buy companies that provides pipes, valves and solutions to water treatment. You can invest via 2 ETF:
- PowerShares Water Resources (PHO) an ETF focused on small and medium US companies such as Valmont Industries and Badger Meter.
- PowerShares Global Water (PIO) an ETF focused on medium-sized to large international companies such as Suez Environment and KSB Aktiengesellschaft.
Investing in water companies is probably a long term bet (5 to 10 years or more) and you should probably not expect rapid gains, especially in the current environment.