This time of year I keep a bucket in the kitchen sink and anytime there is a quick rinse of a plate or washing hands, I catch it and make several trips a day into the yard to pour it around the base of crops. I have a sprinkler set up to run every third day to help keep the general garden soil somewhat moist (so it doesn't turn rock hard and make work difficult) and use the hose to hand water crops in general as needed. The gray water reduces the need for hand watering, or at times is what keeps some things going that are beyond the reach of the sprinkler (asparagus isn't eaten once it is a big fern, but keeping it alive means I get the tender sprouts next spring.) The asparagus is off in it's own area and I'm not setting up a sprinkler just for it.