I've been searching around and reading all about this, and have gotten good ideas, but I thought I would post too. We are looking to switch our watering system to a gravity fed waterer, but also trying to figure out if we can still make it work for winter. I think we will plan to use a rain barrel drum- which we will probably just fill with our hose, and that will connect to fill our water bucket with a float valve in it. My questions are 1) Sounds like if I keep debris out of the rain barrel and maybe add in ACV, will that help curb any algae/bacteria from growing in the barrel? Any other better ideas? 2)We live in the midwest- has anybody used a gravity feeder in winter like this set up, how do you keep the hose from freezing? (I was looking into bird bath heaters/livestock heaters to keep the barrel from freezing- and may have to have a heater under the bucket it is going into as well) Thanks I appreciate any feedback!