Hi,
Well I would start with 1 meal a day and build up - hitting her with 3 meals will not be good for little digestive system.
IMHO, I would start be slowly introducing things. Just until her tummy is used to solids going through it. Watch for things like banana, rice, sw pot etc as they can make them constipated and it is easier to spot the culprits if you don't introduce too much at once.
I think it is OK to introduce meat straightaway, in fact I think if you wait till 6 months it is pretty much recommended as it is a good source of iron.
Water - I think I was still boiling it. I BF though so not 100%, I would imagine that the FFers are still boiling the water for bottles?
Yes, cow's milk can be used for cooking.
HTH x