I’ll not send you to their website as when you try to get hold of the information it’s a bit of a mind field of IT popup boxes, but here’s a brief summary:
Water Less Often
Reduce the number of times you’ll need to water by using the following:

Water-retaining gel ... this may look strange when it’s in your compost but it’s really useful (I always use it in my hanging baskets to keep the compost damp)
Manual watering systems ... I’m guessing here they mean systems that you have to fill up, so control the amount of water you give your plants so water isn’t being supplied constantly
Soil reservoirs
Break the crust ... I’ve read that if you dampen the top of the soil first, then come back after about half an hour and then water it soaks in better
Add organic matter
Mulch ... helps stop the soil drying out
Let the grass grow longer ... and don’t cut it as short
Provide shelter for your plants ... so they’re not in full sun (OK, one has to say not everything can be in the shade can it?)
Bigger pots ... so more compost, so it doesn’t dry out as quickly
There’s lots more advice out there so I’m sure our gardens won’t turn in to barren deserts if we’re careful and spend a little more time planning our watering ...