A couple of days ago, I had my kids, and the weather decided to turn wet. It was latter in the evening so we didn't loose out on any outdoor activities, but what amazed me we that my oldest daughter (5 years old) grabbed a plastic pumpkin that held old Halloween candy and ran out back with it. I followed behind, curious as to what she was going to do with it.
She put it down in the rain to collect water as it ran off the roof, as I suspected, but what was amazing, was her reason; She wanted to help the family to not buy water in a store, so she was collecting it for us to drink so that we could save money.
I couldn't begin to tell her how proud I was of her for coming up with that all by her self. Not to be left out my youngest followed suit and found her own pumpkin.
We spent the rest of the night figuring out how to filter the water that they collected. As it came off the roof it had leaves, tar pebbles and other junk in it and was orange in color. I showed them a couple of methods to rough filter the big chunks out, but we couldn't get rid of the color by bed time. I explained that even if we can't make it drinkable (If it ain't crystal clear and properly filtered, I not going to let my kids drink it unless it's a real emergency) We could still use it in the garden, for watering plants.
I did have a couple of real filters available and could have used them at any time, but I think they learned more, and certainly had more fun, doing it the hard way.