Hi
My DD was EBF until 6 months and I then weaned her onto formula (bottle). No issue from her with the bottle as I used to express and DH would give her an evening bottle while I cooked (had cup of tea, ate choccies...).
Rather then put her on the bottle, why don't you go straight to a cup (sippy, free flow)??
At 7.5 months your DD should be able to drink easily from a cup and with 3 to 4 milk feeds per day that should be no issue.
It will simply save you from having to wean her onto a cup in a couple of months time.
When my DD was about 8 months I used to give her milk out a cup when she was teething as it was easier for her to drink it like that as sucking was sore on her gums.
And here was my mistake! I didn't switch her over to cup at that point. I should have as she was willing and able to drink entire milk feed (250ml) from a free flow cup.
I stated using the bottle again once she got her top front teeth and was no longer sore. Weeeeell, she is now 15 months and refusing to drink milk from any other receptical than a bottle. I've tried cold turkey and I caved after 4 days as it was hot weather and she was starting to refuse water too (she's only ever had water out of a cup).
Hence I would strongly recommend the cup as your DD should be able to drink a milk feed out of a cup.
As for type of formula, can I recommend
Hipp Organic! My DD spat out Cow &Gate and SMA and refused to drink it and cried.
She would drink Aptamil but it was very slow and with a scowl (at least it seemed like a scowl).
She wolfed down the Hipp Organic and absolutely loved it.
Having tasted all of them I found Hipp the least vile (they are all pretty vile but babies do like it).
On your question about cows milk. Your DD is too young as other posters have stated.
Cows is not high enough in fat and carbohydrate and far too high in protien for babies on under 12 months to have as their milk.
Milk is the most important part of the diet for babies under 12 months.
As I'm sure other poster will tell you, many babies don't eat much until they get to 9 months and beyond. Others get into solids straight away and chomp down huge portions early on. They are just all different.
Hope its all going well for you.