low flow water storage trick?

[NiHaoMike]

I read on some reptile website about someone who set up a garden hose over an outdoor turtle pond and set the faucet to drip, in order to ensure the pond will always have water. Someone else mentioned that at these really low flow rates, the water meter becomes inaccurate since a significant amount of the flow leaks past the mechanism.

If that's true, could it be possible to have a needle valve precisely drip water into a tank for later use?