 [ Symptoms ] what should i eat during a flare up of ulcerative colitis symptoms [ Disease ] as long as you are on municipal water there is no need to boil it the powder does not mix well in ice cold water    lukewarm tap water works best remember tap water is what heart surgeons wash their hands in it is very close to sterile and much more stringently controlled and monitored   by law   than bottled water do not waste your money and do not contribute to growing landfills by buying bottled water except for maybe those times when you need a bottle to travel even then refillable bottles are cheap and work just as well 