The best part about growing food in your backyard is that in general the water consumed by food plants is about the same as green grass or ornamental plants. So, if you yard has non food plants that you water, your water consumption is not likely to grow by a lot.
Further, irrigation of Lettuce Farms is precisely controlled based on moisture data coming from the sensors, what’s growing, and the weather conditions. This results in a very efficient use of water - a precious resource. So, for example, when it rains, your Lettuce Farm’s irrigation system will automatically not turn on, till the soil needs moisture again.