Coolrunner DIY Automatic Plant Waterer Accessories Water Seepage Device for potted plant & bonsai outdoor or indoor use (12) Economical watering system Keep plants watered while you're away Fits plastic water or soda bottles You can combine water and plant food in a bottle then use the water spike to deliver the ultimate nourishing fluid. Garden watering device. These handy garden watering tools help deliver water where plants need it most.