Hydrofogger.Com - Commercial and Industrial Humidifiers - Hydroponics Printing Concrete Tobacco
This has been the best humidifier I found and I looked for months before buying.
Does not need a high pressure line, just 1/4 inch waterline, just like the ice cube maker line.
I just reread your post and added this part:
You could hook up the 1/4 inch line to a five gallon bucket above the fogger and it can gravity feed the fogger.
I have had mine for 2-3 years now very reliable.
Get their humidistat so you can adjust the humidity to your needs.
The Hydrofogger does not need any adjustments, so it is plug and play. The fog is very much like real fog very buoyant and does not make a wet mess like some of the other foggers that were mentioned...
They have two models.
I do not have any affiliation with this company,
It is just the best humidifier that I found after many months of reading/researching on line.
Buy right the first time and you will not be sorry!