I have always used the 2.5 gallon jugs with the spout. Either drinking or spring. Store brand. Left on counter and was perfect temp. I won't drink tap water so I won't give to my babies.
Sounds like your doctor is just being really cautious. My doctor always said to use regular tap water because babies need the flouride in it. But not well water.. he said there is no need to boil tap water, the cities do so many tests on it all the time to make sure it's safe for thosands of people everyday, probably more than most bottled water companies do. if your in the U.S. it should be just fine. Don't waste money on nursery or filtered water
I have 4 kids and have used warm tap water with all. My 3rd was in NICU for a week and that is what they had me do. So I figured if the nurses there food it, it was fine.
I just used filtered water or water bottles. I never boiled it. I would understand boiling if you're using tap water. And you can buy a bottle warmer. But rather than using the stove you can take a bowl and put it in the microwave to heat the water then sit the bottle in it for a couple minutes.
I used to buy bottled water bottles and just leave it at room temperature and mix the formula like that. My daughter ate perfectly and had no problems with it. It was easier than warming it up every time.. especially if we were out and about
Its just purified water..