Switching to formula question

I’ve noticed a slight decrease in my milk supply and baby boy is only getting bigger and hungrier! It’s crushing me to think our time breast feeding might be nearing an end.

I’m thinking I’m going to need to either top up or switch to formula in the next little while. Just wondering, if your baby is formula fed how often / how much do they eat?

I do have a small stash of milk in the freezer that I’ll work through first, but I know eventually we will end up on formula - even if it’s just for a short period.

He’s started solids (cereal) and loves it and can’t get enough, although we’re only giving it to him for “dinner” right now.

Any advice would be so appreciated :)