I posted the other day about not getting much when I pump. I've tried different things but my body seems to max out at 2 oz. I'm still wanting to give LO at least 1 bottle per day so she doesn't refuse them again, and she will now chug down 5 oz (probably more if I had more).
So instead of having to do 3 pumping sessions to get 1 stinkin' bottle I want to try mixing half and half (inspired by today's UO!)
So here are my questions...which may or may not be dumb questions

Do I need to heat the breast milk and formula separately, then mix? or mix together in the same bottle and then heat up? (LO needs her milk WARM)
How much formula does she need to get in a day to stop giving D drops? (aka giving D drops every couple days if I remember...)
The only reason I want to mix the two instead of just giving a formula bottle is because she will probably refuse it and also I'll have to pump any way since I'm skipping a feeding.
Thanks!
Re: Mixing formula with breast milk
Like you, if I get 2 oz pumped at a time, it's a happy day. so we mix bottles all the time. I do 4 pumps a day and usually get close to 7oz for the day. We send S to school with 5 bottles, 4 5oz ones, and 1 2oz. One of her 4oz bottles and her 2oz bottle are strictly formula. Her other 3 bottles is a mixture of formula and bm. We split the BM into 3 bottles, mix the formula in one big bottle and then pour it into the 3 BM bottles until we get to 5oz. We do this all in the morning and at school they just warm it up like normal.
As for the drops, our pedi said if she's getting more than half her intake through formula, there's no need for vitamin drops.
Hope that helps! If you need any other info on mixing, feel free to let me know, like I said, we've been doing this for months now
What worked for us may not be everyone's cup of tea, but it did result in a baby that happily takes all formula bottles (from all BM) and even prefers the cheapest formula out there (Sam's Club). We mixed starting with a 5:1 ration (5 oz BM, 1 oz Formula) and then every 2-4 days (depending on how much I had pumped and in what quantity I bottled the expressed milk), and then adjusted for less BM/more formula. It wasn't exact. Some bottles were 5:2, some 4:1, some 3:3 (meaning, we didn't always do a 6 oz bottle- we just went with our gut for a gradual taste change).
The 3 biggest success factors for us where 1) my husband's support that it was time to stop pumping, 2) consistancy in always offering a mixed bottle and 3) knowing that some BM was going to go to waste and being ok with that. After all, the end goal for us was to stop BM all the way, so I couldn't get upset if part of a bottle went down the drain.
Some other tips: if you make the formula with really hot water, then you don't have to heat the BM as much. Always give the formula time to settle so the bubbles come out. Lexie likes her formula really warm, almost hot. We always made/heated the formula separately from the BM and then once both were a good temperature, combined them in one bottle.
Good luck! I hope it goes well.