First time using bottle.. help!

Tomorrow will be baby’s first time using a bottle in 3 weeks. She’s 10 weeks old. It’s our 2 year anniversary tomorrow so we’re gonna spend the day just me and him. She’ll be with my cousin, and I don’t know how much milk to thaw out for her. She nurses on demand so I’m not sure what to do here. I have a stash for occasions like this. So far I took 6- 4 oz bottles that are full and put them in the fridge to thaw.. do you think this might be enough? Should I take more out to thaw? Pls help! I don’t want her hungry throughout the day..

Ps, I’m gonna be so paranoid leaving her for the first time this long 😭