Re:San Francisco declares state of emergency to prepare for ...
by AstralStorm on Wednesday February 26, 2020 @06:53AM
(#22422206)
You need chemical treatment and not boiling for rainwater. It is often chemically polluted because we're still burning contaminated hydrocarbons, typically with NOx or SOx (nitrates or sulphates). These are rather unhealthy, but in a short emergency it's fine.
You definitely want to boil river or lake water.
But I would say definitely store food and medicine. Keeping your energy levels up is important for maintaining your health. Getting ill is just another way to die.