I painted a car in a home garage in the middle of a Georgia summer and didn't have any issues with moisture. Dryers are nice but you can work around them on a budget.
From the compressor I had a standard moisture separator and filter that fed into two 50' air hoses. One hose was coiled in a shop sink filled with ice water. At the end of the second hose I used a DeVilbiss Desiccant Snake which is a 3' hose filled with desiccant beads. On the end of that before the gun I used the little inline filters and replaced them every time I filled the cup. It was a decent amount of effort but not nearly as hard as redoing a panel because of moisture or oil issues.
IMG_4350 by
willtel, on Flickr