Since garden sprinklers can use as much water in an hour as a family of four uses in a day, it is time to hand over this water guzzler to the Terminator! Use a watering can, and collect rainwater in all the empty tubs, bowls, tins, etc. that you own.
Always water early in the morning or in the evening to prevent water evaporating before it reaches the roots.
Cooled water from your shower, bath, sink, and laundry can be re-used to water non-edible plants.