This is quick tip for people who love saving water and those who want to learn how to water:
Make the most of the water your butts collect from roof gutters in periods of low rainfall
In warm weather, light, patchy rain will not get deep enough into the soil to water your plants effectively. But it will be filling up your water butt.
So, water your plants from the butt while it is raining AND your butt is filling up.
This way, when the drizzle stops, your plants will be thoroughly watered and your water butt should be full, because you were using water that was otherwise going to overflow and go to waste.