i had good atomization success with the nozzles from pressure spray bottles (i bought 3 cheap ones from mitre10 for like $9 and threw out the bottles and haxed out the nozzles) this combined with a fuel pump that puts through about 30-40-psi
the only problem with a fuel pump is water corrodes it until it seizes, so something else that puts out a similar pressure made of plastic or aluminum or something would be the go.