The best time to get plants in the ground is in autumn so they have six to nine months to settle in and establish before the hot weather sets in. Even young drought tolerant plants need looking after, with a drink once every fortnight during the first summer. If you plant in spring you will need to water once or twice a week.
Be sure to use ecofriendly soaps/detergents to avoid contamination, or reuse the water on non-edible parts of your garden. Greywater is produced every day, all year round and is a reliable source of irrigation.
*Not recommended for the elderly or those with restricted mobility.