How are y’all transitioning from bottle to cup?

My daycare just emailed me saying that since my lo is almost a year that we will need to start sending her in without a bottle. Of course this will be a slow transition. I was thinking of taking away the midday bottle and replacing it with milk in a sippy cup, but for how long should I do this before I start taking away the morning bottle?

Also, what kind of milk should I give her? Are there any powdered options out there like formula? I just hate it how milk goes bad so fast.

Any suggestions are much appreciated. FTM here!