LeonP... I live in hurricane country so I store around 12gal in dedicated spigoted containers year round...change out the water at the beginning of the season, with a couple of drops of Clorox for good measure...for more immediate threat (I have a single bath so don't use something like the water safe which is a good idea for a multi bath home) I use a new 33gallon plastic trash can in my bath tub/shower... fill it for bathing/flushing as I can still use the drain in the tub... dedicated lawn sprayer painted black for shower (electric hot water heater) ...I place an additional plastic trash can to catch rainwater from the eaves just outside my rear steps...I have a couple of Sawyer/Sweetwater filter bottles available and a supply of Clorox/tincture of iodine as well as some Katadyn chlorine di oxide tabs if necessary

I've been fooling around with a 5gal bucket solar desal apparatus this summer, but about 350ml per day is my yield so far... when I get to 500ml will do a write up