Breastfed baby going to daycare- help!

My little guy is EBF and is going to daycare in 1 week (😭😭😭). He is 10 weeks old. I feed on demand and we really have no set schedule of when he eats. I occasionally give him a bottle of breastmilk- I fill it with 4 ounces and sometimes he eats it at, sometimes not. How do I know how many bottles to fill for daycare and with how much?! Also, should I start feeding him more bottles this week to “prepare” him?? Any suggestions or advice is appreciated 💕

Pic because he makes my heart smile 😍