Our NICU told us to boil our tap water. We had city water, which is harmless, but we still boiled it. In fact, she will be 9 months old this month and we are still boiling her water at our house and using a filter at my parent's house.
Sophia Elizabeth born at 28 weeks, 6 days. Weighing 3lbs, 3oz and 15 1/8" long.
We used distilled water in the beginning; not Nursery Water brand because it is fluoridated and too much fluoride is bad--same reason I still don't use tap water. Even though we only do 2 formula bottles a day. We now use the large "drinking water" jugs (the ones that are larger than a gallon and have the little spigot spout). Hard to tell how much we used because they were constantly taking in more and more every day and every week.
after 10 weeks of bedrest for contractions and shorting cvx they arrived at 32 weeks!
Re: Nursery water?
Yep. Our pedi said not to bother with it. Tap water is fine.
We'll miss you sweet Debbie Girl (4.21.12) and sweet Cindy Girl (8.9.12)

BPF May 12, 2013 :: EDD Janaury 22, 2013 :: MC Began On July 14, 2013 at 12W4D
Born at 34w2d:
We were actually told not to use Nursery water. Supposedly bad for their gums and teeth. We use tap.
after 10 weeks of bedrest for contractions and shorting cvx they arrived at 32 weeks!