OK folks, I was talking to a friend the other day, and he was asking why couldn't he use just plain tap water and I kept telling him that he needs to use distilled. He was wanting to just use tap water and throw away his floral foam every now and then (his wife is a florest so he can get as much as he wants). I didn't have an answer for him. I know that using tap water will cause build up on the humidifier, but would it do anything else? Hurt the cigars in anyway? I just know to use distilled water and didn't really ask any questions. Thanks.