I have about 789 house plants.
All my visitors ask: How do you water them all? How long does it take?
For the larger ones I use an old fashioned garden water can.
But, for all the smaller ones and the hard to reach ones I use this
https://www.amazon.com/dp/B000AQNQ4Q/
Have had it for years. Need to clean out the tip about 3 times a year but otherwise faultless.
You can use tap water, rain water, distilled water.
2 Liter is the right size. Big enough to be handy but not so big it is hard to hold, handle.
You can add fertilizer if you want.
It is sold as a sprayer but I really only use it to water.
I have the tip adjusted for a coarse stream as I do not want to drill holes into the soil but still want accuracy. I water the pot, not the saucer, without harming the plant.
It can extend and the tip can angle differently. I can easily water plants that I cannot even touch. Allows me to really pack them onto a shelf.
I could not due without it.
Gene