I have something like 150 gallons of storage. that's less then 2 days usage. The drought this summer was something like 30 days between rainfalls and that rainfall was only a drizzle and I doubt a drop got to the barrels. It then went another 2 weeks before raining again. That rainfall filled the barrels in a few minutes. graywater would help but realistically I use a lot of water in the summer. The good news is I live somewhere reasonable to use water for gardening in the summer. Vancouver island isn't known for it's desert like conditions.
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