Last year, my kids had a school project to take care of an ornamental plant in a home-made self watering pot.
The idea is simple. Take a used plastic bottle and cut it up. Use the bottom part as the water reservoir. You can add pebbles to make the unit heavy and prevent it from toppling over. Also optional, is to cover the outside with masking tape to prevent algae from growing.
The top half will be the planting pot. Drill or poke a hole into the cover. Attach a string (like yarn) into the hole. Turn it upside down and put it on top of the reservoir, with the string soaking in the water. Put soil into the pot and water the soil. Plant.
The kids’ projects have been home since March. I refill the reservoir regularly as needed, maybe once every 7 -10 days. Other than that, they haven’t needed any care, and no need to water them. It’s a great idea if you are going on vacation or out of town for a few days. Plus, no need to buy a pot and it’s a great way to reuse old plastic bottles.