Ok, so we made the famous bucket with holes sitting in a large flower pot saucer waterer. The lid forms an airtight seal so all is well. Since we didn't want to hoist 5 gallons of water to fill and flip, I plumbed a valve on top for the hose to connect to, for filling. There's also a ball valve to close to maintain vacuum when not filling. However, when filling, so much water just flows freely from the bottom, there must be a better way. How do others do it? I wonder if I need a small valve on top to open for air to escape while filling. By the way, this is temporary until I get the 55 gallon drum in place to feed the device. Then I'll simply top off the drum weekly or something.