Hello again. My place came with a reverse osmosis water filter. I put a t-joint in the supply line to the tank, and fill up a 35 gallon barrel with 'ro' water for my orchids. I also use it in the humidifier under the theory of not getting the mineral buildup. As stated above, the reservoir empties almost every day so you shouldn't be worried about bacteria. As for algae, the reservoir is usually dark enough, and empties quick enough so that none can start growing. It is quite a hassle keeping it filled.
You should not need a timer, as they come with adjustment knobs that shut off when your desired level of humidity is reached.
I you haven't bought the humidifier yet, I'd suggest going o line. When I did, I called the 800 number and was informed that they were having a 2 for 1 sale so I got two, with free shipping, for about $40.
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