I'm not familiar with push in? We purchased screw in and are very happy with them. We used a 5 gallon bucket with a lid, drilled a hole (smaller than the screw), and screwed them right in!
We learned two lessons:
1. Don't screw them in too tight or they will leak.
2. Drill a couple of holes at the top of the bucket because with a sealed lid it will create a vacuum as the chickens drink and then after a bit the water won't come out!
"When raising chickens you must think like a chicken...NOT like a human!"