Let us know how your own system works out if you try it. It will be raining, off and on, through the week.
To cut a long story short, we were unable to do this yesterday. We plan on setting it up for next year.
In the meantime, we set one 35-gallon in our side yard and started filling it with extra water we have caught from our faucets. We already put buckets in our showers and we use that to flush but often the five gallon bucket is too full (heavy) to add to it. We will empty that into the can in the morning when there is water in it. Also, it takes at least three gallons to get hot water at our kitchen sink. We have been catching some of that to water plants, but will now fill a bucket and put it in there. It's amazing how much we put in there in one day.
So, we will continue to fill it and just sink a bucket on there to water our veggie garden and roses this summer. Then this fall we will set up a system. Just wasn't in the cards yesterday.