I have five red comet hens who have access to the grassy area under my deck, which has lattice all around it. I want them to be out in the yard, but we have a lot of hawks around here, so I made a small tractor for them. (We call it the playpen). I am trying to figure a way to connect it to the under-deck area because it would be a lot more room. And in the process I'm trying to make a larger tractor. However, in the meantime I have had all sorts of problems with water. I got a traditional red-and-white watering thingy and tried hanging it like I hung the feed. They kept knocking it over and spilling ALL of the water. So I put it on the little porch area, and they seem to be fine with that. But when they're in the tractor, the ground is grassy and usually lumpy. Every time, they knock over the waterer. I tried hanging it, but they manage to knock it over still. Any ideas?!? They have no problem with food, don't really spill a whole lot, but water is the issue. I worry when I go out to check on them and they have no water! There doesn't seem to be a flat, nonmoveable place to set the waterer. And the playpen is made of hardware cloth and PVC pipe, so it's pretty flimsy compared to some tractors I've seen. I hope this makes sense?! How do you keep water from spilling in a moveable tractor?!