C.D.
Breastfeeding and formula feeding are different both in substance and in delivery so that has to be taken into consideration when sifting through suggestions.
Giving water at the 2am feeding means that you are still having to get a bottle of water and sit up and give it to your baby who is likely going to fight it because she really wants to nurse and go back to sleep. If she did wake because she is hungary at that time, water has no calories she will likely wake up an hour or so later. Babies wake during the night for all sorts of reasons not just because they are hungary. She is growing, teething, starting to hit some developmental milestones. It is completely normal for her wake the amount that she is. One of the great benefits of nursing is that you have the easiest, most convenient remedy for nighttime baby issues in the world and its worth taking advantage of.
It.s ok to take whatever appoach is easiest and gets you and your baby the most sleep. This may very well mean that you cosleep for part of the night. Lots of moms do this even if they don't admit it. Don't worry about her being in the bed for part of the night, she will not be in there forever. If it gets you through these next few months of teething and growing so be it. It is so easy to just snuggle in together, nurse and go right back to sleep especially when the nights are chilly. Just because you take her into your bed for part of the night doesn't mean that you still can't work on gently encouraging her sleep in her own space when you have more energy.
Breastfed babies around your daughters age tend to get distracted easily when nursing so try to make sure that she is getting some really good nursing during the day and especially in those last couple of hours before bedtime. This may help to decrease some nightwaking. Your breastmilk has more calories and nutrition than the solids that she is getting at this point.
It is tough to have a baby waking several times a night (I have a 7month old who is also breastfed) and it has always been helpful to me to read breastfeeding friendly books that also talk about normal baby behavior, needs, and development. Maybe check out "The Baby Sleep Book" by Dr. Sears or "No Cry Baby Sleep Solution"
Good luck!