Desperate for advice

Hannah
My son is almost 8 months old and he's breastfed.  I have a huge freezer stash of milk for when I need it, and in August I start school.  My mom will have him while I have class.  The problem is that he won't take a bottle or a sippy cup.  I also just found out I need dental work done that I need to be sedated for and he would need a bottle for like 24 hrs til the medicine wears off.  How do I get him to take a bottle?