DIY Home Backup Water With No Electricity

DIY no electricity required backup water system.
We used a 150L pressurized buffer tank (diaphragm tank) to create an emergency backup water supply at home that is ideal for intermittent water supplies or just to have as a backup if the water goes out.
We tested it on a supply with only 2.3bar incoming pressure but still managed to fill a bath with about 20cm full of water just from the backup tank.
This makes it a great option for short outages where you just want something to allow you to still use the toilets and wash your hands while the water is off.
Any size tank can be used with a similar concept but it will just change the amount of water stored.
Here are the options for it:
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