We had a roof catchment system at our cabin in AK. Steel roof - rain gutter into 55 gallon wooden whiskey barrels. First barrel was half sand on top of half activated charcoal. Then into second barrel for storage. Worked well and the water alway tasted real good. In the winter we just brought a five gallon jug of water from home. Melted snow if we needed more. There was no plumbing in the cabin. Dip what you needed out of the second barrel.