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I am not familiar with "pounds of downward pressure" as used in your example. I set up an elevated rain barrel and calculated the PSI at: A column of water has 1 psi for every 2.31 feet of height. Nowhere did it mention pounds of downward pressure. As far as I know, a 1 gallon jug of water would...

Given the picture that OP showed us in the first post, I was suggesting that any water container with a vinyl hose running down into a float valve mounted in the watering dish would work. You don't need any pressurized water system and I was not suggesting any kind of equal water elevation...

A gravity fed system is all you need. You don't need water pressure for the valves. Any container of water above the level of water desired will work. Very simple design to build.

+1. Check out something like these float valves, installed in the pan of water, to automatically shut off the water flow when it reaches your desired water level in the pan. With a float valve, you don't need an inverted water container and any complicated negative pressure setup. Any sized...