Drip-irrigation hoses are inexpensive, however, and it's easy to turn the water on and let it drip for a few hours. Water timers work well too because they can be set and then left alone. Keep the compost pile close by to save trips between the pile and the garden. The same holds true for the garage or tool shed. The greatest labor-saving gardening product is mulch.
Nothing does more to control weeds, maintain soil moisture and improve the health of plants.