I cant think of the proper name but I need to make one of those things to keep water dripping into the tank to replace evaporation while Im on vacation. How do I make one of these?
A drip system. Larger tanks use them since changing the water in a tank of a few hundred gallons could take 10+ hours. Although I believe you need to be near a well to have one because of the chlorine in tap water.
You can set up a drip system when you have municipal water, you just have to install the right filters to make sure the chlorine and the chloramines are removed.