Humidity?

i have a small grow box on the go and its locted in a heated garage. the humidity is reeding at about 35% how are some easy ways to get the humidity up?
cheers

bowl of water in there or damp towels.

turn this onyoull luv it. fogger.

thanks i put a wet towl in there and have been pouring some water in some trays and have got the humidy up to the 50s !