Looking at the April weather we have been having, this must be the wettest drought there has ever been! Seriously, we have two water butts on our greenhouse and five on our house. We have now ordered two more, as it seems impossible to collect enough water to stop them running dry through the summer months. Good large butts are quite expensive, by the time you add on the base and the linking kits. It would be cheaper to just use tap water, I am beginning to think, but rain water is much better for plants. And I wash my car with it, too!