My DD2 is just 3 & still has a pop top to go to sleep.
She's only just out of day nappies for the second time, so I'll give night ones a bit more time yet.
With the bottle/pop top, I'm trying to get Bri off it & sometimes I just put her to bed & tell her I'll get it & just forget. She usually will fall asleep with out it. Sometimes she needs it though.
When i do get it I only put a bit in the bottom. A couple of mouthfuls.

With DD1 I put a nappy on her for bed, but she took it off to go to the loo just before bed & I didn't know. She was 3 & 4 months. When I got up the next morning she was dry, so I made a big deal out of it & that was the last night nappy. 3 years later & she still occasionally wets, but its only every few months now. At the start it was every few days.
The first time I attempted it I put a garbage bag, then towel under her fitted sheet as a mattress protector. Til I got a proper one.

As I said, DD2 needs more time. I'll wait til it warms up a bit. No one wants to go to the toilet in the cold!