use a ultrasonic fogger for a humidfier. or 2 of them. these actually supply water ain a micron size so small that it would always fit into the stomata with no problem meaning the waer droplets are smalle than the size of the stomata, which means that you can actually the ultrasonic fogger to deliver nutrients to your plants.
or
use a fan, a can and a water wick. put one small can inside of a larger can and put floral sponge or water wicks in there, or humidty pads for hvac humidity systems, if the fan is facing down blow into the small can and ventilate the upper wall of the inner can/tube so the humidty can be be forced through vent holes. same kind of stuff for the fan facing up. make sure that the fan is only as big as the inner can/tube.
or
Offworld's BADASS METHOD
use a box fan facing down into or up from a drain tub and put 2humidity sponge/screen/wicks on each side of the fan but down far enough into the tub to be soaked, and the wicks should be the width of the tube so that the air blows through the water screens and not over or around, then suspend a bottle of water upside down with a tube coming from that supply of water by natural suction/siphon when you put the tube from the jug into the water the tub will eventually lower the water level and suck out the water from the upside down jug...thus refilling itself.
