Any brand is fine.
Any of the store bought brands of nursery water should be suitable for your baby.
Don't pay more than $1 per gallon jug, or you're getting ripped off. It should be noted that, unless your area puts too much Fluoride
in the water (it does happen in parts of the U.S. And elsewhere), you can simply boil tap water for 5 minutes and let it cool to room temperature before mixing it, saving you money.
Answer assisted by Cole Livingston, Medical Student