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To start you must have an as big as possible collection surface, like a roof, and metal is preferred. A single plain is easier like a "shed roof" design. A gutter is typically used to collect the rain and re-direct it to a holding tank. From the gutter the water should be filtered of debris before entering the holding tank. When the captured water is drawn out of the tank, depending on its use it should be fine-filtered before animal or human consumption.
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