Rainwater collection systems can be a great way to save money on water. They are pretty simple to put together. You can use the water for your garden, lawn or even building up your emergency water supply. It is important to remember that in some cities and states, especially dry climates, it is against city code to install rain capture systems. I know this is crazy so make sure to look into that before getting started. At the bare minimum you can have one ready for an emergency situation and install it then.