Empty a couple wine bottles or plastic soda bottles. You’ll need one bottle per plant.
Fill each bottle with water. If you use any plant food, add it to the water.
Screw a plant nanny stake to the top of each bottle. The stakes will screw on just like the bottle caps.
Flip the bottle upside down and drive the stake into the soil of your plants. The stake should be in deep enough so that the bottle is held up in the air. The stakes slowly allow water out as needed, watering the plant over a number of days or weeks. Remember to keep an eye on the water levels of the bottles and refill as needed.