Locally made un-glazed porous clay pots​ you bury in the soil with the neck exposed. Once filled, the water seeps into the soil by capillary flow at a rate that provides nearby plants with a constant water source directly at the roots where they need it.  These Ollas are made to autofill by having a barrel or bucket nearby so the hose can keep the Olla full. Just dig your hole, place the Olla, and Water 36 inch circle!