Set up a rainwater collection system that can divert rainwater from downspouts to rain barrels. Rainwater is probably the best water for your plants. Notice how your plants look greener and healthier after every rain; and by having a rainwater collection system, your plants can have access to rainwater regularly.
Want to take this project seriously? How about installing a water filtration system like the one offered by SJ Wave to filter rainwater from your rain barrels for home use. A good filtration system can remove dusts and particles in the air that have been borne as rain falls. Connect pipes to your toilet, shower; or use it to wash your cars or connect it to your laundry machine. Rainwater being naturally soft can prevent limescale build-up that can impair the life of your household appliances. Ponds too are better topped with rainwater since it's free from chlorine treatment that can adversely affect wildlife.
Ever heard of fog catchers? Much like a rainwater collection system, you collect water by trapping fog moisture in nets that drip in gutter pipes down to a barrel. Water collected may be used much like rainwater and can even be consumed for drinking using a filtration system