Economizing at Home

I'm trying to economize on the usual stuff that I use around the house, like the consumption of electricity and water among others. If I could save a buck or two here and there, that would mean a lot in the long run. I am thinking of buying stainless steel drum to catch rain water that can be used in watering the lawn and plants. That way I could save a lot of money by replacing the gallons of water that I normally use with rain water, very brilliant right? Summer in New England state can get really hot and water bans are usually imposed in certain areas. But with rain water stuck in a drum, you can water anytime you like.