[header] How to harvest rain water in a household setting [title] Designate a section of your roof. [step] If you're looking for a simple water collection solution that will allow you to begin harvesting right away without making any costly updates to your home, just look up. The roof is the most commonly used catchment area. 
It's also the most easily adapted, thanks to the expediency of gutters and other fixtures. [substeps] For best results, designate a downspout directly beneath a steep part of the roof where water tends to accumulate.