You DO NOT NEED TO USE DISTILLED or Reverse Osmosis WATER! Simply use GOOD FILTERED water. You can get ZEROWATER 22 cup model for only $25 - it will remove all minerals and easily last a year. The unit is silent, easy to configure and will easily humidify an entire floor. A BARGAIN under $100. Much better than Honeywell Evaporative Units - we had several of those and they are NOISY and a pain to constantly fill up