Bottle warmer

I used this with my first baby with the avent bottles. Literally zero complaints. I’m due with my second baby in about 3 weeks, I received this warmer as a gift. Great! I intended to sterilize and reuse the bottles I had from my first baby, and purchase new nipples. Wouldn’t you know I’m having a difficult time finding them in the slow flow speed for newborns. Out of them basically everywhere, Walmart, target, and Amazon.

Have any of you used this warmer with a different brand bottle?