if the power goes out, water is more important than food
sunlight will make water taste foul and grow bacteria over time
So, you're saying sunlight will turn water into turkey and yogurt?
FALSE - water properly filtered and bottled in PET plastic bottles has a shelf life of at least two years. There will be some water vapor loss through the container wall as well as CO2 and N2 gas exchange. Data on sterile filtered water storage in PET plastic, 1000mL containers go to over five years with no change in pH, clarity, taste or odor. Even better storage conditions and shelf life is possible in thicker walled polypropylene containers.
I know this to be true, 30 years experience in the pharmaceutical industry.
> if the power goes out, water is more important than food
Absolutely unnecessary to buy bottled water, unless you really want to.
There is plenty of clean fresh water in the reservoir of your toilet, on the assumption that you don’t use any disinfectant product (you know, them blocks that turn the water green or blue...) Just take the lid off the reservoir and scoop out what water you need.
Probably best not use the water in the basin for anything other than handwashing WITH SOAP. Three tablespoons of chlorine bleach added to that water should render it reasonably safe ON THE ASSUMPTION YOUR BASIS IS CLEAN. Don’t flush this water, just re-use it for washing.
There is also plenty of fresh water in your hot water heater. Just turn on the drainage fawcett and collect the water into a bucket.
Sunlight will kill bacteria, but will promote algae growth.
Yuk!