As a FL hurricane veteran here’s some advice on fresh water.
As to eating, cooking, and personal hydration:
Buy cases of bottled water. 1 case of 24 half-liter bottles = 3 person-days. I pay about $3 per case at the grocery store, so that’s a dollar per person-day; not too exorbitant.
Have enough cases on hand for 14 days per person in your household. Figure about 1/2 person-worth for each child under 10 and each pet. Rotate your stock so no case gets more than about 3 years old. They keep, but not forever. The half-liter bottles are much easier to consume in the normal course of daily life than big jugs. So the stock rotation happens pretty automatically
As to water for flushing and washing …
Buy the 15-20 gallon “tupperware” storage tubs from a hardware store or a place like Bed, Bath & Beyond. They’re about 2’ x 1.5’ x 1.5’ and are meant to organize & store the excess crap we all own too much of. You want 1 or 2 such tubs per person in your household.
When not needed you can leave them empty or put all your dedicated power outage batteries, solar flashlights, solar phone chargers, solar radios, 24-packs of AAA, AA, C, & D batteries, etc. into. Pus your tarps, ropes, duct tape, work gloves, etc. Your complete emergency management kit. Do not EVER raid those supplies for a non-emergency use. But do rotate your stock of batteries even if that means throwing away unused packages 3 years later.
When a wind-, ice-, or snow-storm might threaten your power, empty the tubs of emergency supplies and put the tubs in your showers or bathtubs. Then fill them with water & leave them there. If it’s not freezing outside and you have a garage or shed you can put even more out there and fill them with a hose; I live in a high-rise, so it’s the showers or nothing for me.
When you need to wash people or dishes, use a saucepan to scoop some water out of a filled tub into the stoppered bathroom sink & do your washing & minimal rinsing there.
For toileting, designate one for #1 & one for #2. Only flush the #1 toilet once a day. Quickly pour a saucepan-ful of tub water into the toilet and that’ll flush it adequately for #1. For #2 you probably need to flush via the normal flush handle every time then refill the tank using the saucepan-from-tub method.
Once those tubs are filled with water you’re not going to move them easily or safely. So put them in their final resting spot before filling them. But when the crisis is over they’re easy enough to tip over to drain while they’re still sitting in the tub or shower or outside. Not so much inside your shed.