the nursey water in Walmart cost like a dollar i was giving her bottled water in the beginning because I didn't wanna go anywhere i was depressed for the first 2 weeks , as long as the water is not contaminated its fine , if you boil water and put it in a gallon so that way you wont have to keep boiling water everytime i would fill up at least 3 or 4 gallons that should last for more than a month maybe 2