I've posted this a couple of times already, but in case there might be a new member... if you are fortunate to have lead time as in the case of a hurricane, a Rubbermaid trash barrel in your bathtub or shower allows you access to water with which to flush the toilet (pour slowly into bowl... try this before you use the toilet) and water to wash with... there is room to stand and still have a drain for the rinse water in the shower stall... a second barrel under the eaves fills pretty quickly and has yet to be moved by the wind

I have a couple of the blue 6gal water containers with spigots ... water is rotated out at the beginning of each hurricane season

I've yet to try out my Sawyer .1 micron 5gas bucket filter