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How to make a dropper for hydroponics so that one drop per hour falls? Give some advice.

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I made a system on ordinary medical droppers, where in 6-8 hours at a maximum clamp I dug up to 10 liters. It all worked without electricity and required the constant presence of man. At the same time, if you make a device (again without using electricity), when one drop would drop at an o'clock, then the system would work without "recharging" up to several days.

Can anyone have any ideas? In hours, the speed of one arrow is slowed down relative to the other by 60 times with the help of gears, how can I be an analogy of deceleration with water?
It seems difficult to make mechanical watches with some kind of feed, is there probably an easier way?
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The problem, if I understand correctly (I have been friends with hydroponics for more than 5 years), is not to drop 1 drop per hour, but to create the necessary moisture content of the substrate, we decide from here .... if a small level of solution at the bottom of the pot is possible, we block the dropper with the specified rise level ... if only the humidity of the substrate, then we select a sensor that works without electricity (long hair, toys "expansion" from humidity, etc.) ... although if you can allow 1.5 - 5 V, the range of sensors expands noticeably . I have 220 without interruptions, so valve timers and pumps work .... Success.
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Take a picoPower controller, the output of which is a nozzle from an old printer (or an electronic clock with a shutter from 1.5v) Everything is powered by a 3.7v battery
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I heard about timers, there are even whole stations for hydroponics. But I want to come up with something on non-volatile principles, so I would bring it to the country and it worked without electricity and batteries, and better all season without maintenance.
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There are all kinds of timers on Ali. Professionally on Arduino to do

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