Product review (5 stars): Great humidifier! Read on for some easy tips!
Very happy with this product. I fill an  empty gallon water bottle at the sink and carry it over to the humidifier. I purchased a red funnel  with a very long spout, called Flotool, at Walmart's auto dept. that fits perfectly in the tub opening so that I am able to pour the water from the water jug into the humidifier tubs. Makes filling it very easy!
(Puncture a small hole in the top of your gallon water jug handle so that the water flows out  smoothly while you are pouring it into the tub)
 Don't forget to add a humidifier bacteriostatic treatment  which helps control bacteria and algae growth in the water tank.  I also add a separate humidifier water treatment which prolongs the life of the wick filters and helps prevent lime scale buildup. I add these to the jug of water before I pour it into the humidifier tub.