Here is one idea https://www.hometalk.com/9659726/wine-bottle-plant-watering-stake
I used to do this all the time when we would go on vacation. I would set up my plants with a string coming out of the soil from the bottom of the pot and have the string long enough to be submerged into a container of water that would be enough water to last while we were gone. The plant drinks itself using this method. This is called a watering wick system. Since then though I have bought those pretty glass balls that you add water to and submerge the pointy end of it in dirt. https://www.amazon.com/Trenton-Gifts-Multi-Colored-Watering-Measures/dp/B07MH67F17/ref=asc_df_B07MH67F17/?tag=hyprod-20&linkCode=df0&hvadid=309807711822&hvpos=1o1&hvnetw=g&hvrand=16466628823390353124&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9007919&hvtargid=pla-623079226982&psc=1
The plant drinks what it needs as well. If you are referring to making an actual pot that is self watering, check out this you tube video: https://www.youtube.com/watch?v=3qlKw70-1XQ. Good luck!
one idea could be to use bottle of water used up side down and making some holes to have some small drops
Here are some ideas for you! Hope they help!
One way is to place a strip of cotton cloth in a container of water and then place the other end in the pot. This works well for those who may be going away on a vacation for a short period of time.