Rain Barrels

Just watched on planet green how to make rain barrels. I have 2 already for my trip, but I will not be using them for rain collecting unless it rains alot in Pilot Valley. They will be used to store shower water. Plan to shovel snow in winter to fill the barrels for free shower and plant watering. Will get some more and use it for shower waste water and then use the waste water to water plant life and if i can some how figure a way to clean the waste water, use it for shower water again. Supposedly if you add some bleach to the snow or rain water, you can drink it. I do not think I will rely on that.