What kind of volumes are you talking about? Basically cow's milk is not a complete food for a baby, the way that breast milk or formula is. At 11 months I'd be happy giving cow's milk in a cup, when probably only about 2oz is likely to be consumed.
The exact proportion of milk to solid food is going to vary from child to child, as is when they consume that. My daughter at this age would have gone 9-3 without needing a milk feed as she took her milk in 3 big feeds, in the morning, late afternoon and before bed. My son on the other hand struggled to last 4 hours in the morning without a milk feed.
This is a personal thing, but I don't think cow's milk should be offered in a bottle, I think it encourages too much volume to be consumed and though cow's milk is our societies preferred method of toddlers getting fat and calcium etc. too much milk leads to problems such as iron deficiancy anemia, one pediatrician I spoke to said she sees far more problems from too much cow's milk than too little.
So if you're talking a couple of small cups worth, then I'd do it, if you're thinking a couple of 6oz+ bottles, then that needs to be breastmilk or formula.
Is there any particular reason you want to avoid formula? I know I used to feel some kind of pride in not using formula, but I've since realised that cow's milk is just another substitute for breast milk and if you need a breastmilk substitute then use the best available, which at this age is probably formula. Personally I'd be worried about powdered formulas not being sterile and that the temperature of water needed to make them safely destroys some of the good stuff in them, so I'd go with ready mixed. Choosing cow's milk simply to avoid formula is the wrong reason in my book.
