Right now I'm using 1 gallon plastic waterers. I'm wanting to get a 3 gal or 5 gal one. I will need about 3. All my birds are large fowl and will be no more than 10 in a pen full grown but more as babies. I have 3 choices and just don't know. I found a 3.5 gallon at ts for 17 something.you unscrew it from the bottom just like my 1 gallon. Then they have a 3 gallon that you can fill from the top for 27 and a 5 gallon for 33. Not 100% on prices. My parents take care of my birds when I go out of town every other weekend ad they like the little giants better so they could just fill from top. But I like the cheaper ones. Lol. So I guess I'm going to spend more but would you get a 3 gallon or 5?